Executive report of the Illinois State Entomologist ...
[Springfield, Ill.] 1900-1915.
In 1917 the State Entomologist's Office merged with the State Laboratory of Natural History to form the Natural History Survey Division of the State Dept. of Registration and Education.
Report year ends Oct. 31 (1899/1900 covers period April 11, 1899 to Oct. 31, 1911; 1905/06, Jan. 1905-Oct. 31, 1906).
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