WIA GC/1902/228 | Kalf, Jan to Warburg, Aby 02/02/1902 | |
WIA GC/1903/160 | Kalf, Jan to Warburg, Aby 06/05/1903 | in reply to Warburg's request he sends him bibliographical information on Dutch folkloristic... |
WIA GC/1905/259 | Kalf, Jan to Warburg, Aby 09/03/1905 | he will reply to his request in due time |
WIA GC/1905/260 | W. [?], J.v. to Kalf, Jan 11/03/1905 | replies to an enquiry; cannot find mention of a play dealing with Valentin and Oursson |
WIA GC/1905/261 | Kalff, G. Gerrit to Kalf, Jan 11/03/1905 | replies to an enquiry, cannot find mention of a play dealing with Valentin and Oursson ['De... |