WIA GC 1930/394 | KBW to Boysen, [Christian] 23/07/1930 | |
WIA GC/1912/152 | Boysen, Christian to Warburg, Aby 31/12/1912 | informs him that the book by [Auguste] Demmin, 'Handbuch der Waffenkunde' costs Mark 12 and... |
WIA GC/1913/173 | Boysen, Christian to Warburg, Aby 28/08/1913 | replies to a complaint by Warburg on a price differential for an English book |
WIA GC/1913/174 | Warburg, Aby to Boysen, Christian 28/08/1913 | accepts what Boysen has written, that when selling English books he will charge Warburg the same... |
WIA GC/1914/119 | Boysen, Christian to Warburg, Aby 20/01/1914 | informs him of a new book, Giulio Ulisse Arata, 'L'Archittetura arabo-normanna e il Rinascimento... |