@book{ Solr-4352939, title = {Aeronautical planning chart, United States}, editor = {U.S. Coast and Geodetic Survey}, address = {Washington, D.C.}, publisher = {The Survey}, year = {1940}, note = {Standard parallels 33⁰ and 45⁰.}, note = {Relief shown by gradient tints.}, note = {Inset: Map showing charts published by the U.S. Coast and Geodetic Survey and index map of radio direction finding charts.}, note = {"3060 b."}, }