A map from the U.S.Geological Survey Camelback quadrangle (1911) showing the waste-bordered mountains of the Arizona Highlands. The text notes the lack of a permanent stream, the large number of intermittent streams as shown by the...

A map of a portion of the San Bernardino Mountains near Big Bear Lake in 1911. The map is based on the USGS San Gorgonio quadrangle, with contour intervals of 500 feet. "Bear Valley and the adjacent country exhibit the subdued relief...

A contour map from a portion of the USGS Georgetown quadrangle (1906) showing the present topography of the Georgetown district of Colorado. Contour intervals are 500 feet.

A contour map from a portion of the USGS Georgetown quadrangle (1906) showing the assumed older topography of the Georgetown district of Colorado with older montainous upland features restored. Contour intervals are 500 feet.

A contour map showing the topography of the Highwood Mountains, Montana. The contour intervals are 200 feet.

Dozens of statistical terms are defined and illustrated in this glossary.

A map from 1911 showing the canyon of the Snake River at the Seven Devils along the border with Oregon. The sketch contours are shown at intervals of approximately 500 feet. The cross-lined areas represent basalt-covered surface; the...