A review of geographic variation in continental populations of the ruby-crowned kinglet (Regulus calendula)
By: M. Ralph Browning.
Series: Nemouria ;; no. 21
Publisher: Delaware Museum of Natural History]
Published: 1979
Place of publication: [Greenville, Del
Language: eng
Subjects: Ruby-crowned kinglet -- Variation -- North America.; Bird populations -- North America.
Notes: Bibliography: p. 8-9.
Caption title.