Speciation and geographic variation in Black-tailed Gnatcatchers.
Chicago: American Ornithologists' Union, 1987. Octavo, black and white photographs, maps, wrappers. American Ornithologists' Union Monograph number 42. More
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Festschrift for Ned K. Johnson: geographic variation and evolution in birds.
Chicago: American Ornithologists' Union, 2007. Octavo, paperback, colour photographs, maps, other illustrations. American Ornithologists' Union Monograph number 63. A series of papers in honour of Ned K. Johnson on geographic variation and evolution of birds. More
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