Crawford’s Division served as a member of the Fifth Corps in the Army of the Potomac. Brig. Gen. Samuel W. Crawford commanded the Third Division of the Fifth Corps at Gettysburg. Samuel Crawford was born in 1846 in Pennsylvania. He graduated from the University of Pennsylvania in 1850 and its medical school in 1851, joining the army as an assistant surgeon.
He was serving at Fort Sumter as the Civil War began, and commanded several guns during the bombardment in spite of being medical staff. Combat command apparently appealed to him, for shortly afterwards he accepted a commission as a Major in the Infantry
Crawford was wounded at Antietam after briefly commanding his division. He didn't recover from the wound until May of 1863, when he was given command of the Pennsylvania Reserves, then recovering from hard campaigning by serving in the Washington defenses.
The Gettysburg crisis saw two brigades of the Reserves return to the Army of the Potomac. Crawford led them into the fighting around Little Round Top at the end of the day on July 2nd. Crawford seizied the colors of the First Pennsylvania Reserves from a surprised Corporal Bertless Slot. After a brief struggle and with Corporal Slott running alongside his horse grasping his pant leg, Crawford led his division in a charge that cleared the Valley of Death and, in his estimation, saved Little Round Top.
Crawford remained in command of his division through the Overland campaign and the Siege of Petersburg and was again wounded at the Weldon Railroad. He was with the army at Appomattox, one of two men (the other General Truman Seymour) who could claim to be present at both the beginning of the war at Fort Sumter and its end at Appomattox.
After the war Crawford stayed on with the army until his retirement in 1873. He took a leading role in helping to develop Gettysburg as a memorial park. at one point purchasing land around Little Round Top to build a museum. Crawford died in 1892 and is buried in Philadelphia.
The Brigadier General Samuel W. Crawford Statue is located on the right or east side of south Crawford Avenue if traveling north and 370 feet southwest of the Wheatfield Road intersection. The monument only a few feet from the road. The 
Brigadier General Samuel W. Crawford Statue is just ahead or 78 feet north of this tablet. 
Parking is available along the avenue at intermittently enlarged shoulder areas. This is never one of the busier roads so it is safer to walk around more than the other sites. Take care to not park on anything remotely green looking as Park Police will happily ticket you. I visited this site on Monday, July 1, 2013 on the 150th anniversary of the Battle of Gettysburg @ 3:29 PM, EDT & @ an altitude of 522 feet, ASL. As always, I used my trusty and oft abused Canon PowerShot 14.1 Megapixel, SX210 IS digital camera for the photos.
Draw the Sword, with descriptive help from the NPS site, offers the following description: Monuments are rough-hewn monoliths, 4'2" x 2' x 7' in height, consisting of Winnsboro, South Carolina granite. Bronze inscription tablet, 3'8' x 3'6¾", is affixed to the polished face of the monolith. Corps insignia, a bronze Maltese Cross, is excised & polished at top of tablet.
Army of the Potomac
Fifth Corps
Third Division
Brig. General Samuel W. Crawford
First Brigade Col. William McCandless
Third Brigade Col. Joseph W. Fisher
July 2. Moved to Little Round Top late in the day and went into position on the right of the Wheatfield Road. On the retreat of the troops from the Wheatfield in front after sunset the First Brigade was advanced against the pursuing forces and drove them across the Plum Run marsh and beyond the stone wall and into the Wheatfield. The Third Brigade was sent to the left to take possession of Round Top.
July 3. The first Brigade remained in position until about 5 p.m. and then advanced across the Wheatfield and through the woods beyond and on the left capturing many prisoners. The Confederates retired to the crest of the ridge they originally formed on. These positions were held until the close of the battle.
Casualties. Killed 3 officers 23 men. Wounded 17 officers 164 men. Captured or missing 3 men. Total 210
There are hundreds of non-sculpted monumentation for the various Regular Union (Army of the Potomac - Federals) units & "Regular" Confederate units engaged at Gettysburg from July 1-3, 1863. There are about 10 different variations of tablets, markers & monoliths by my reckoning. Six designs represent brigade (2), division (2), corps (2), & army headquarters (only 2), each different in a subtle way so as to distinguish between armies. Battalion/battery/advance position markers & regimental monuments for U.S. Regulars & Confederate have their own distinct design (2), bringing the total to 10 designs at the battlefield. The bronze tablets (these ones, too) were created by Albert Russell & Sons Co. of Newburyport, Mass. The granite bases which accompany the various tablets were created by the Van Amringe Company from Boston, Mass.
These battery tablets were cast by Calvin Gilbert. Gilbert joined the 87th Pennsylvania Volunteers when the "Rebellion" broke out. Since he was musically inclined, he was made a member of the regimental band. In early 1863, he was promoted to the rank of Captain and sent to Washington D.C. for commissary duty. He served in that capacity until the war ended in 1865, and at war’s end earned the brevet rank of Major. 
After returning home to Gettysburg, Major Gilbert moved his family to the town of Chambersburg, where he served as the Superintendent of Schools. He also opened an iron foundry there in 1868. When Calvin learned, nearly thirty years later, in 1894, that the Gettysburg Foundry was available, he purchased it with a business partner & moved his family back to Gettysburg. For the next twenty years, the Calvin Gilbert Foundry created ironworks that are still seen today on many historic forts and national battlefields (this tablet), from upstate New York to Florida to Lookout Mountain. Gilbert lived to be 100 years old and attended the Last Reunion of the Blue and Gray for the 75th anniversary of the Battle of Gettysburg when he was 99. He was a most remarkable man who lived an amazing life.
There is an excellent excerpt in the American Guide Series about Gilbert attending the 75th reunion anniversary.
The 1910 Gettysburg Commission report lists the awarded contracts to these companies (not Gilbert) for the tablets. 
All of these tablets were designed by architect Colonel Emmor Bradley Cope (July 23, 1834 - May 28, 1927). He designed pretty much every tablet for both the Union & Rebel armies, each one distinct, w/ several different varieties. He is buried in Evergreen Cemetery in Gettysburg, as well he should be as this park and most of the things seen here today were designed by him and as such, are his legacy. These monuments were erected just after the turn of the century during the first & beginning of the second decade of the 20th century. Each one has since been preserved or restored at least twice since the turn of the 21st century. The plaques & tablets were erected by the Gettysburg Park Commission (established by the War Dept.), after they took over the administration of the park from the Gettysburg Battlefield Memorial Association (whose funds had expired) on March 3, 1893, and whose stewardship was then transferred to the National Park Service in 1933) SOURCE The Gettysburg Park Commission is also referred to as the Gettysburg National Military Park Commission or the Gettysburg National Park Commission, to clear up any confusions, especially my own.
On October 1, 1898, the Gettysburg National Park Commission in a letter to the Secretary of War set gave recommendations for continuing the task of organizing & progressing the work of the Gettysburg National Military Park. Every November they wrote their annual report which outlined the work of the GNPC for that year. The following is an excerpt from that report relevant to this waymark. The link at the end of the paragraph will take you to the entire report. The method of marking the positions of troops on this field, as approved by the War Department, is to place the principal tablet or monument of each command at the position occupied by the command in the main line of battle, and to mark the several important positions subsequently reached by each command in the course of the battle by subordinate and ancillary tablets, with appropriate brief inscriptions giving interesting details and occurrences and noting the day and hour as nearly as possible. SOURCE
Most of the Commission reports have been digitized and can be found HERE. The initial 1893 report up to & including 1921 can be found here. 1922 to 1926 are missing & have yet to be discovered. The years 1927 to 1933 were discovered in 1996 and are also included. To my knowledge this is the most comprehensive list of documents that illustrated the development and formation of the park.
Information about these specific types of monuments:
DIVISION HEADQUARTERS MARKERS (For Union & Confederate Monuments)
Division headquarters are rectangular bronze tablets mounted on large, rectangular stones. Union headquarters have a corps or service branch symbol (like a cross, clover, star or crescent moon) as a separate bronze piece above the tablet (this one has the Maltese cross), while Confederate headquarters are labeled "C.S.A." on a separate bronze piece in an oval. There are 22 Union and 10 Confederate Division markers at Gettysburg. Both markers are of similar design and were all construed of Winnsboro (S.C.), granite. Each stands seven feet in height. SOURCE & SOURCE
The Crawford's US Division Tablet is a contributing feature to the Gettysburg Nat'l Military Park H.D. which is nationally significant under NR Criteria A, B, C & D. Areas of Significance: Military, Politics/Gov't, Landscape Architecture, Conservation, Archeology-Historic. Period of Significance: 1863-1938. The monument is designated as structure no. MN437.
From the Nomination Form:
1 of 23 Civil War US Corps Tablets in Park. Records movements & intinerary of 5 Corps, 3 Division which was commanded by Brig General Crawford.
Short Physical Description:
Rough-hewn monolith, 4'2"x2', 7' high. Bronze inscription tablet, 3'8"x3'6 3/4" mounted on polished face of monolith. Bronze Maltese Cross, corps insignia excised & polished at top of tablet.
Long Physical Description:
Located on E side of Crawford Avenue, S of Wheatfield Avenue.
My Sources
1. NRHP Nomination Form
2. Stone Sentinels
3. Virtual Gettysburg
4. Draw the Sword
5. Historical Marker Database