San Bernardion Area, California: Three maps showing water-level contours for the San Bernardino area for spring 1936, spring 1945, and spring 1951; east-west geologic section from Colton to Mill Creek Canyon; geologic section from Shandin Hills southeast to Bryn Mawr; and water level profiles along the section from Colton to Mill Creek Canyon
San Bernardion Area, California: Three maps showing water-level contours for the San Bernardino area for spring 1936, spring 1945, and spring 1951; east-west geologic section from Colton to Mill Creek Canyon; geologic section from Shandin Hills southeast to Bryn Mawr; and water level profiles along the section from Colton to Mill Creek Canyon