(1957). Mineral deposits and occurences in Vermont exclusive of clay, sand and gravel, and peat. U.S. Geolog. Survey.
Chicago-Zitierstil (17. Ausg.)Mineral Deposits and Occurences in Vermont Exclusive of Clay, Sand and Gravel, and Peat. Washington, D.C: U.S. Geolog. Survey, 1957.
MLA-Zitierstil (9. Ausg.)Mineral Deposits and Occurences in Vermont Exclusive of Clay, Sand and Gravel, and Peat. U.S. Geolog. Survey, 1957.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.