United States 15 minute series (topographic) /
Geological Survey (U.S.)
[Washington, D.C.] : The Survey,
[1882-194-?]
Topographic map series covering much of the United States. Each map shows contour lines, spot heights and other topographic features in brown; water features in blue; and buildings, roads, other works of man, political and administrative boundaries in black. Most sheets drawn after 1911 also show forest cover in green.
Series title given according to modern usage. Sheet titles vary from the pattern shown. Some sheets include a county name before the quadrangle name. A few include the names of one or two additional states; and state names are sometimes abbreviated. Most sheets drawn before 1901 use "sheet" in lieu of "quadrangle."
Statement of responsibility varies. Some sheets mention the Department of the Interior. Many give state-level offices equal billing. All credit individual employees of these agencies.
Individual sheets bear a survey date, an edition (i.e., publication) date and often a reprint date too.
A few sheets are as large as 61 x 42 cm.
Graphic indexes in Map Reading Room.