@book{ Solr-7450837, title = {Puerto Rico, cuadrángulo Ponce ... : serie de 3 3/4 minutos}, editor = {Geological Survey (U.S.)}, editor = {Puerto Rico. Department of the Interior}, address = {San Juan, P.R.}, publisher = {Departamento del Interior, Sección del Mapa Topográfico}, year = {1947}, edition = {Array}, note = {Relief shown by contours and spot heights.}, note = {Each sheet includes sheet coverage index.}, }