Chemical and biological surveys of the waters of Illinois.

Issued, 1917- as Bulletin no. 15 of the Division of the State Water Surveys, Dept. of Registration and Education.Issued, 1906-1916, as Water survey series, no.6-14, University of Illinois bulletin, v. 4,no. 3; v. 6,no. 4; v. 7,no.2; v. 8,no.23; v. 9,no. 20; v. 10,no. 36; v. 11,no. 38; v. 13,no.l9; v. 14,no.5; v. 15,no.11, respectively.Mode of access: Internet.1