USGS QUADRANGLE (1:24,000) --
Boundaries of 7.5-Minute Quadrangles, 1999 (1:24,000)
Shows the boundaries of the 7.5-minute quadrangles of the U.S. Geological Survey. Attributes include dates of publication and photorevisions of paper quadrangle maps.
FGDC metadata: QUADRANGLES_24K_USGS_IN