Metsker's map of Imperial County, California

1942

Chas. F. Metsker

1:127k

Automobile road map of Imperial County, California

1930

Automobile Club of Southern California. Neyhart, A. P.

1:300k

Imperial County.

1935

California Division of Highways

1:205k

Irrigation district and road map, Imperial Valley

1914

Rock, Geo H.

1:180k

73. Soil Map, Imperial Sheet, California.

1903

Holmes, J. Garnett

1:127k

74. Alkali Map, Imperial Sheet, California.

1903

Holmes, J. Garnett

1:127k

Imperial Valley tract map

1914

Rock, Geo H.

1:125k

Atomic Airspace Reservations. PLEASE POST IN A CONSPICUOUS PLACE.

1950

U.S. Atomic Energy Commission

Topographic Map of Salton Sean and Vicinity Californiania

1925

US Geological Survey

1:625k

Imperial County California. America's Winter Garden

1934

Imperial County Board of Trade