Maclure, William (1817). Observations on the Geology of the United States of America; A 1962 REPRODUCTIONMaclure, William (1817). Observations on the Geology of the United States of America; with Some Remarks on the Effect Produced on the Nature and Fertility of Soils, by the Decomposition of the Different Classes of Rocks; and an Application to the Fertility of Every State in the Union in Reference to the Accompanying Geological Map. A 1962 REPRODUCTION published Werner Fritsch, Buchhandler, Ulm Donau, and Stechert Hafner, New York. 129pp + 2 foldout