Species taxa of North American birds: a contribution to comparative systematics.
Cambridge MA: Publications of the Nuttall Ornithological Club, No. 9, 1970. Octavo, More
Cambridge MA: Publications of the Nuttall Ornithological Club, No. 9, 1970. Octavo, More
Greenville: Delaware Museum of Natural History, 1982. Quarto, colour plates, fine copy in publisher's binding. More