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Du Pont, William, 1855-1928 (correspondent), Johnson, Walter A. (correspondent), Advanced Agricultural Publishing Company (publisher)
Letter from Walter A. Johnson of 'The Field' magazine to William du Pont promoting the magazine and advertising space in the magazine for du Pont to advertise his horse breeding. Also included is a full color copy-proof of the front cover of the November-December 1917 edition.
Du Pont, William, 1855-1928 (correspondent), Waring, J. W. (James W.), 1857-1935 (correspondent)
Letter from J. W. Waring, publisher of the 'Official Horse Show Blue Book' to William du Pont confirming and thanking du Pont for his subscription to the book and discusses including photographs of horses that du Pont has bred in the book.