Dover Paperback reprint of the Bulletins originally published by the United States National Museum. This Dover edition, first published in 1987, is an unabridged and unaltered republication of the work first published by the US Government Printing Office as Smithsonian Institution US National Museum Bulletin 126, Part 1, 1923 and Bulletin 130, Part 2, 1925. Two volumes bound as one. An encyclopedic collection of information about 73 subspecies of ducks, geese, and swans.