7.5 minute series (topographic) [of the United States] /
Geological Survey (U.S.)
Reston, Va. : The Survey,
[19--?]-
Relief shown by contours and spot heights; on some few sheets, by shaded relief, contours, and spot heights.
Commonly known as topographic quadrangle sheets. Each sheet individually titled by name of quadrangle.
Prior to early 1970s, published in Washington, D.C.
Quadrangle location index on most sheets.
Graphic indexes of individual states in Map Reading Room.