Ralph E. Ehrenberg

1937

• Mapping the world
• Scholars' Guide to Washington, D.C., for Cartography and Remote Sensing Imagery
• Library of Congress Geography and Maps
• Archives & manuscripts--maps and architectural drawings
• Cartographic records in the National Archives of the United States useful for urban studies
• Cartographic records in the National Archives useful for urban studies
• Mapping the world
• Pattern and process