7.5 minute series (topographic) [of Puerto Rico] /
Geological Survey (U.S.)
Puerto Rico.Department of Public Works.
Reston, Va. : Geological Survey,
1958-
Relief shown by contours and spot heights.
In upper margin: Commonwealth of Puerto Rico. Dept. of Public Works.
"Quadrangle location" diagram in margin.
Sheets named separately in bottom right margin.
Various eds.
Graphic index with maps.