How we make ducks pay ... an illustrated guide to the profitable breeding of our modern Pekin all-white mammoth ducklings; plain and thorough lessons for beginners and others everywhere who write for the details and secrets of our waterless method... - American Pekin Duck Company, Boston. (Boston, Mass, American Pekin duck company, 1907)
https://www.biodiversitylibrary.org/bibliography/58774
Keywords: Ducks|