A comparative study of bird populations in Illinois, 1906-1909 and 1956-1958
By: [by] Richard R. Graber [and] Jean W. Graber.
Contributors: Graber, Jean Weber, 1924- joint author.
Published: 1963
Place of publication: Urbana
Language: eng
Number of pages: 528
Subjects: Birds -- Illinois.; Bird populations.
Notes: Bibliography: p. 516-518.