Volume 31 • 1925 • Annual Reports, 1923 and 1924, with Accompanying Papers
Front Matter
Front Matter, Iowa Geological Survey, Volume XXXI, Annual Reports, 1923 and 1924, with Accompanying Papers
1925-01-01 Volume 31 • 1925 • Annual Reports, 1923 and 1924, with Accompanying Papers • 1-6
Article
Letter of Transmittal
George F. Kay
1925-01-01 Volume 31 • 1925 • Annual Reports, 1923 and 1924, with Accompanying Papers • 7-8
Mineral Production in Iowa in 1923 and 1924
James H. Lees
1925-01-01 Volume 31 • 1925 • Annual Reports, 1923 and 1924, with Accompanying Papers • 9-52
The Geology of the More Refractory Clays and Shales of Iowa
S. L. Galpin
1925-01-01 Volume 31 • 1925 • Annual Reports, 1923 and 1924, with Accompanying Papers • 53-90
The Fertilizer Materials of Iowa
John E. Smith
1925-01-01 Volume 31 • 1925 • Annual Reports, 1923 and 1924, with Accompanying Papers • 91-152
The Distribution of Ash and Sulfur in Iowa Coals as Affected by Washing and Flotation
H. L. Olin and J. R. Troeltzsch
1925-01-01 Volume 31 • 1925 • Annual Reports, 1923 and 1924, with Accompanying Papers • 153-166
Trilobites of Iowa and some Related Paleozoic Forms
Otto Theodore Walter
1925-01-01 Volume 31 • 1925 • Annual Reports, 1923 and 1924, with Accompanying Papers • 167-390