WIA GC/1899/20 | Warburg, Aby to Colvin, Sidney 20/01/1899 | acknowleges the receipt of Colvin's letter; replies to his criticism of Warburg's review of... |
WIA GC/1902/321 | Wolfhagen, G. to Warburg, Aby 24/02/1902 | list of people who were sent copies of Warburg's article 'Bildniskunst', 18 in Germany, 15 in... |
WIA GC/1904/98 | Colvin, Sidney to Warburg, Aby 22/11/1904 | informs him that the British Museum has the Otto print; on the Flemish niello cup; on the Picture... |
WIA GC/1904/99 | Colvin, Sidney to Warburg, Aby 19/12/1904 | he was sent the photograph of the Sternberg 'Baldini'; on the niello cup and the school of... |
WIA GC/1905/97 | Colvin, Sidney to Warburg, Aby 21/01/1905 | he will forward the photographic order shortly |