Biennial Reports

by Babcock, E.J., 1901, 103 p., 13 pl.

Discusses the topography and general geology of the state and presents Three brief summaries of clay, coal, and water.

by Wilder, F.A., 1902 (second edition January 15, 1903), 262 p., 39 pl.

Devoted almost entirely to the lignite deposits of North Dakota.

by Leonard, A.G., 1904, 236 p., 33 pl.

Contains papers on the topography and geology of North Dakota, lignite deposits west of the Missouri River, methods of stream measurement, and stream runoff.

by Leonard, A.G., 1906, 340 p., 37 pl.

Devoted entirely to the clays of North Dakota, including stratigraphy, economic geology, uses and value, methods of brick manufacture, and a description of the North Dakota clay industry.

by Leonard, A.G., 1908, 278 p., 30 pl.

Discusses the geology of southwestern North Dakota, with special reference to coal; the geology of northeastern North Dakota, with special reference to cement materials; the manufacture of hydraulic cement; laboratory tests in cement making with North Dakota materials; the geological history of North Dakota; the Bottineau gas field; and road materials.

by Leonard, A.G.,1912, 165 p., 21 pl.

Contains papers on the geology, topography, and coal deposits of south-central North Dakota, with a geologic map of the region; and on the physiography and geologic history of the Devils Lake and Stump Lake region.