TRAITE DE LUTHERIE by Francois Denis, 2006, isbn 2-916545-10-6, The Voilin and the art of measurement, Deluxe edition, no 23 of 35, signed by the author
FACHWOERTERBUCH DES STREICHINSTRUMENTENHANDWERKS by Thomas Gerbeth, 1995, isbn 3-923639-02-3, German-English/English German dictionary of Stringed instrument terminology
THE ELEMENTS OF DYNAMIC SYMMETRY by Jay Hambridge, 1968, isbn 486-21776-0, Signed by Roger Hargrave
BARON LUDWIG KNOOP by Ludwig Matzner, 2006, soft bound
LUDWIG KNOOP by Adele Wolde, 1998, isbn 9783931785901
THE VIOLIN HUNTER by William Alexander Silverman, 1957, The Story of Luigi Tarisio, first edition
CHATS ON VIOLONCELLOS by Olga Racster, 1907, Signed by the owner H. V. Bowen Jan 1919
RUDIMENTS OF MUSIC by T Keighley
THE CURVES OF LIFE by Theodore Andrea Cook, 1979, isbn 0-486-23701-X, first published 1914
Letter: Roger Graham Hargrave (photocopy) (Jul 2 2025) Photocopy of letter by R. G. Hargrave dated July 2 2025