(2) 1920-1964: 1965-1966: S. H. Schurr, B. C. Netschert, et al., U.S. Bureau of Mines, Minerals Yearbook, U.S. Bureau of Mines, Press Release of Series are not strictly comparable due U.S. Bureau of the Census, Statistical Abstract of the |
(2) 1920-1964: 1965-1966: S. H. Schurr, B. C. Netschert, et al., U.S. Bureau of Mines, Minerals Yearbook, U.S. Bureau of Mines, Press Release of Series are not strictly comparable due U.S. Bureau of the Census, Statistical Abstract of the |