Reference

Charles Atwood Kofoid (1903): Plankton studies. IV. The plankton of the Illinois river, 1894-1899, with introductory notes upon the hydrography of the Illinois river and its basin. Part I. Quantitative investigations and general results – Bulletin of the Illinois State Laboratory of Nat.History. Frueher:Bull.of the Ill.Museum of Nat.History.Bloomington. Fortgesetzt:Bull.Ill.Stata Natural History Survey. Urbana. – 6: 95 - 629.