Biosystematics of sibling species of flycatchers in the Empidonax hammondii - oberholseri - wrightii complex /
Johnson, Ned K.
Biosystematics of sibling species of flycatchers in the Empidonax hammondii - oberholseri - wrightii complex / by Ned K. Johnson. - Berkeley ; Los Angeles : University of California Press, 1963. - 79-236 p. illus. ; 26 cm. - University of California publications in zoology v. 66, no. 2 .
Bibliography: p. 216-220.
Empidonax.
Biosystematics of sibling species of flycatchers in the Empidonax hammondii - oberholseri - wrightii complex / by Ned K. Johnson. - Berkeley ; Los Angeles : University of California Press, 1963. - 79-236 p. illus. ; 26 cm. - University of California publications in zoology v. 66, no. 2 .
Bibliography: p. 216-220.
Empidonax.