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Iceland spar and optical fluorite /
by H. Herbert Hughes.

APA Citation

Hughes, H. Herbert (Harry Herbert)., United States. Bureau of Mines. (1941). Iceland spar and optical fluorite. Rev. ed. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines.

MLA Citation

Hughes, H. Herbert (Harry Herbert), 1905-, and United States. Bureau of Mines. Iceland Spar And Optical Fluorite. Rev. ed. Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines, 1941.

Warning: These citations may not always be complete (especially for serials).