Helium resources of the United States, 1991 /
by J.E. Hamak and B.D. Gage.

APA Citation

Hamak, J. E., Gage, B. D. (1993). Helium resources of the United States, 1991. Washington, D.C.: United States, Department of the Interior, Bureau of Mines.

MLA Citation

Hamak, John E, and B. D Gage. Helium Resources of the United States, 1991. Washington, D.C.: United States, Department of the Interior, Bureau of Mines, 1993.

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