Plan De L'Embouchure Du Rio Colorado.

1844

Duflot de Mofras, Eugene

California - Arizona

1905

U. S. Geological Survey

1:125k

Sheet No. 3, Department of Arizona

1876

Ward, J.W.

1:665k

Reconnaissance map of the Salton Sick California

1906

Douglas, Edward Morehouse

1:500k

Geological Map ... Rio Colorado of the West.

1858

Ives, J.C.

1:380k

Rio Colorado of the West.

1858

Ives, J.C.

1:380k

Map No. 2 of the El Paso & Fort Yuma Wagon Road.

1858

Campbell, Albert

1:6m

Imperial Valley tract map

1914

Rock, Geo H.

1:125k

Map Number 2 of the El Paso and Fort Yuma Wagon Road

1858

Department of the Interior

1:600k

Metsker's map of Imperial County, California

1942

Chas. F. Metsker

1:127k