Stanford's - Long Acre, London, UK - Literary Sites on Waymarking.com

This extract, from The Hound of the Baskervilles, is taken from the Google books website:

‘Exactly. My body has remained in this armchair; and has, I regret to observe, consumed in my absence two large pots of coffee and an incredible amount of tobacco. After you left I sent down to Stanford’s for the Ordnance map of this portion of the moor, and my spirit has hovered over it all day. I flatter myself that I could find my way about.’
‘A large scale map, I presume?’
‘Very large.’ lie unrolled one section and held it over his knee.
‘Here you have the particular district which concerns us. That is Baskerville Hall in the middle.’

Stanfords website tells us about the history of the company that occupies the building:

During our history we’ve had famous travellers and explorers visit our shop. Well-known figures such as Dr Livingstone, Amy Johnson, Cecil Rhodes, Florence Nightingale, Sir Wilfred Thesiger and Michael Palin have all started their journeys at Stanfords. Even the fictional character Sherlock Holmes bought a map from Stanfords in Sir Arthur Conan Doyle's The Hound of the Baskervilles. And we’ve also had reputed writers and map-makers work for us, including Kenneth Williams, who trained at Stanfords as a map-draftsman before his acting career took off; Laura Stone, Jim Manthorpe, Ben Cole and Alex Stewart (guidebook writers), James Innes Williams (travel writer), Peter Whitfield (map historian), and cartographers Jacob Genelle (went on to the Istitut Geographique National in France) and Magdalena Biszczuk (went on to Imray & Laurie).