United States. Bureau of Mines. Mineral Facts and Problems: 1960 Edition. [Washington D.C.]. UNT Digital Library. http://digital.library.unt.edu/ark:/67531/metadc38790/. Accessed July 1, 2015.
If you are having problems, need to report errors, or have questions or comments for the staff, please use our Feedback Form.
The UNT Digital Library operated by the UNT Libraries provides resources to the UNT Community and users around the world. Please consider supporting the UNT Digital Library today. Donate Today.