1987. Risser, Michele. Relief shown by contour lines and spot heights. Includes references. Scale 1:63,360 Includes text, 2 tables, and location map. by Michele L. Risser... Ohio. Division of Geological Survey.
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1987. Hull, Dennis N. 1948-. Relief shown by contour lines and spot heights. Includes text, bibliography, index and location map. by Dennis N. Hull. Scale approximately 1:63,36... Ohio. Division of Geological Survey.
1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, and 2000. California Geological Survey, California. Department of Conservation, Marshall, Gerald, and Mendes, Eric. This polygon shapefile depicts geologic units within the Elk River watershed in Humboldt County, California. This dataset is the product of the Dep... California Geological Survey.
1987. Risser, Michele. Includes references. Scale 1:63,360 by Michele L. Risser ; cartographic drafting by Robert L. Stewart. Includes text, 2 tables, and location map. R... Ohio. Division of Geological Survey.
1987. Hull, Dennis N. "Contour interval is 10 feet." by Dennis N. Hull. Includes text, bibliography, index and location map. Scale approximately 1:63,360 Relief shown by... Ohio. Division of Geological Survey.