Ordeman, John T. "Frank W. Benson's etchings, drypoints and lithographs, an illustrated and descriptive catalogue." Hickok-Bockus, 1994, Summit, New Jersey.
Notes (object):
Trial proof (b). Nine ducks are added. In some cases the very faint outlines of the ducks in Trial Proof A are filled in, while in others new forms are substituted. One impression, on Shogun paper.