Bureau of Mines / Minerals yearbook metals and minerals (except fuels) 1961
Year 1961, Volume I (1962)
Hartwell, John W.; Schreck, Victoria R.
Diatomite, pp. 535-540
As a work of the United States government, this material is in the public domain.| For information on re-use see: http://digital.library.wisc.edu/1711.dl/Copyright