87 books
Iowa Geological Survey Report, 1908, Vol. 18 (Classic Reprint)
Report on the Geological Survey of the State of Iowa, 1870, Vol. 2
Iowa Geological Survey, Vol. 4: Third Annual Report, 1894, With Accompanying Papers (Classic Reprint)
Iowa Geological Survey Annual Report, 1914, Vol. 25
Iowa Geological Survey, Vol. 19
Annual Report, 1904, Vol. 15
Iowa Geological Survey Annual Report, 1903, Vol. 14
Iowa Geological Survey, Vol. 12
Bernhard Kummel Library of the Geological Sciences (Classic Reprint)
Reports and Papers, 1903 (Classic Reprint)
Annual Report, Volume 12
Annual Report, Volume 11
Annual Report, Volume 15
Annual Report, Volume 7
Annual Report, Volume 19
Bulletin, Issue 4
Contributions to the Palæontology of Iowa
Annual Report for with Accompanying Papers Volume 16
First and Second Annual Report of Progress by the State Geologist and the Assistant and Chemist on the Geological Survey of the State of Iowa, Togethe
Supplementary Report on Portland Cement Materials in Iowa Volume 2-3
Annual Report for with Accompanying Papers Volume 17
Annual Report for with Accompanying Papers Volume 10
Annual Report for with Accompanying Papers Volume 13
Report on the Geological Survey of the State of Iowa; PT. 1. Geology. PT. 2. Paleontology Volume 1, PT. 1