Public ground-water supplies in Illinois

Mode of access: Internet from the Ill. Sect. of State site (as of Feb. 7, 2007).System requirements: Adobe Acrobat Reader.Text (PDF).Title from title screen, as viewed on Feb. 7, 2007.Since the Directors' report includes a statement of the general activities of all divisions, it has seemed advisable to discontinue the publication of an annual report of this division and to prepare instead summaries of our various investigations as they are completed. This policy was adopted with the publication of Bulletin No. 18 in May of 1922, and has been followed since that date. A portion of this material has appeared in abstract form in annual reports published prior to 1920. That material was too meager and scattered to be of practical value. In the present collected form we believe this data will be of very considerable value to the State of Illinois

The depth of sewage filters and the degree of purification

"Bulletins of the state Water survey": 1 leaf at end.At head of title: State of Illinois. Department of registration and education. Division of the state Water survey. A.M. Buswell, chief...Bibliography: p. 78-80.Enumeration continues from preceding title