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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, and 1999. Geological Survey (U.S.). This line shapefile portrays the major roads in the United States, Puerto Rico, and the U.S. Virgin Islands. The file was produced by joining the i... Geological Survey (U.S.).
1978. Powell, Susan and Navarro, Fernando. This line dataset represents the location of railroad lines in Mongolia in 1978. The standard guage track in Mongolia is broad gauge (5'). The data... UC Berkeley Library.
1978. Powell, Susan and Navarro, Fernando. This line dataset represents roads in Mongolia in 1978. Each road segment includes an attribute describing whether it is an "all-weather hard or lo... UC Berkeley Library.