Observations on the geology of the United States of America [microform] : 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 ... /
Maclure, William,1763-1840.
Philadelphia : Printed for the author by A. Small,
1817.
Read as a memoir before the American philosophical society, and inserted in the first volume of their Transactions, new series.
Sabin 43552.
Sabin Group 82.
Microfiche.