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Classification of natural ponds and lakes in the glaciated prairie region
Robert E. Stewart, Harold A. Kantrud
1971, Resource Publication 92
The wetland classification system for the United States adopted by the Bureau of Sport Fisheries and Wildlife in 1953 is described by Martin et al (1953) and by Shaw and Fredine (1956).  That classification has been followed by many biologists in recent years and is especially useful in categorizing in...
Lunar terrain mapping and relative-roughness analysis
Lawrence C. Rowan, John F. McCauley, Esther A. Holm
1971, Professional Paper 599-G
Terrain maps of the equatorial zone (long 70° E.-70° W. and lat 10° N-10° S.) were prepared at scales of 1:2,000,000 and 1:1,000,000 to classify lunar terrain with respect to roughness and to provide a basis for selecting sites for Surveyor and Apollo landings as well as for Ranger and...
Geological Survey research 1971, Chapter D
Water Resources Division, U.S. Geological Survey
1971, Professional Paper 750-D
This collection of 39 short papers in the third published chapter of "Geological Survey Research 1971." The papers report on scientific and economic results of current work by members of the Geologic and Water Resources Divisions of the U.S. Geological Survey.   Chapter A, to be published later in the year,...