73. Soil Map, Imperial Sheet, California.

1903

Holmes, J. Garnett

1:127k

Topographic Map of Salton Sean and Vicinity Californiania

1925

US Geological Survey

1:625k

Imperial Valley tract map

1914

Rock, Geo H.

1:125k

Metsker's map of Imperial County, California

1942

Chas. F. Metsker

1:127k

Imperial County.

1935

California Division of Highways

1:205k

Geologic Map of California, Salton Sea Sheet.

1967

California Division of Mines and Geology

1:250k

A Hysterical map of Palm Springs thru the desert country to old Mehiko

1948

Lindgren Brothers

74. Alkali Map, Imperial Sheet, California.

1903

Holmes, J. Garnett

1:127k

Geologic Map of California, Santa Ana Sheet.

1965

California Division of Mines and Geology

1:250k

1935 Blackburn’s map of San Diego County, California

1935

Blackburn, O.V.

1:250k