ON THE RELATIVE ABUNDANCE OF BIRD SPECIES.

Proc Natl Acad Sci U S A

DEPARTMENT OF ZOOLOGY, YALE UNIVERSITY.

Published: March 1957

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC528435PMC
http://dx.doi.org/10.1073/pnas.43.3.293DOI Listing

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