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Prepared for Coal Preparation and Analysis Laboratory, U.S. Dept. of Energy
...
Revision of American Standard Safety Rules for Installing and Using Electrical Equipment in Coal Mines, M2-1926
A Preliminary Study
Collected During Fiscal Year 1967
Collected During Fiscal Year 1968
Collected During Fiscal Year 1954
(collected During Fiscal Year 1955)
Collected During Fiscal Year 1959
(collected During the Fiscal Year 1960)
Collected During the Fiscal Year 1962
3. Field Investigations, July 1956 to June 1961. 1963
Lanthanum Oxide, Neodymium Oxide, Samarium Oxide, Europium Oxide, and Gadolinium Oxide