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
Ann Arbor: Museum of Zoology, University of Michigan, 1974. Octavo, wrappers, photographs, maps. Miscellaneous Publications, Museum of Zoology, University of Michigan, No. 148. More