http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Henry Gannett, chief geographer ; A.H. Thompson, geographer in charge ; triangulation by R.U. Goode ; topography by C.H. Fitch ; surveyed in 1886.
Relief indicated by contours and spot heights.
Verso: text "The topographic maps of the United States", and key to conventional map signs.