1940. University of Arizona. Library. Statewide coverage of 1940 Census County Subdivisions (Minor Civil Divisions). University of Arizona.
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1950. University of Arizona. Library. Statewide coverage of 1950 Census County Subdivisions. University of Arizona.
1960. University of Arizona. Library. Statewide coverage of 1960 Census County Subdivisions. University of Arizona.
1970. University of Arizona. Library. Statewide coverage of 1970 Census County Subdivisions. University of Arizona.
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, and 1990. This element was computed using snowfall data from the National Climatic Data Center's United States Climatology database. The extreme date is the ... National Oceanic and Atmospheric Administration.
1961. National Climatic Data Center (U.S.). This element was computed using snowfall data from the National Climatic Data Center's United States Snow Climatology (TD-9641M) database (NCDC, 19... National Climatic Data Center (U.S.).
2003. This data represents the locations of earth fissures in central and southeastern Arizona. Earth fissures are pervasive cracks found on valley floor... Arizona Geological Survey.
1994. These data sets consist of the School Districts in Arizona by county. Arizona State Land Department.
1998. The ECOREG coverage provides polygon coverage of the Level III ecoregions for the conterminous United States. The ecoregions shown here have been d... United States Environmental Protection Agency.
1961. National Climatic Data Center (U.S.). This element was computed using data from the National Climatic Data Center's Cooperative Summary of the Day (TD-3200) database (NCDC, 1995). The o... National Climatic Data Center (U.S.).