Volume 31 • 1925 • Annual Reports, 1923 and 1924, with Accompanying Papers

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

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
• 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

Index, Iowa Geological Survey Annual Report, vol. 31 issue 1

1925-01-01 Volume 31 • 1925 • Annual Reports, 1923 and 1924, with Accompanying Papers • 391-400