A pocket edition of Boccaccio's 'Decameron' was one of the things found on the body of Enoch J. Drebber. The name 'Joseph Stangerson' was upon the flyleaf. (A Study in Scarlet)

 

Holmes used this heavy brown volume to lookup Egria, in Bohemia near Carlsbad, where the note-paper was manufacturered. (A Scandal in Bohemia)

 

'A queer old book' that Holmes picked up from a stall, during the case of A Study in Scarlet. Published in Latin at Leige in the Lowlands in 1642. It was a little brown backed volume, printed by Philipp de Croy.

 

Watson was reading this book while Holmes was following Mrs Sawyer during the investigation of Enoch J. Drebber's murder. (A Study in Scarlet)

 

Holmes recommended this book to Watson. (The Sign of Four)