Directory of Illinois mineral producers /
W.L. Busch.
APA Citation
Busch, W. L., Illinois State Geological Survey. (1968). Directory of Illinois mineral producers. Urbana [Ill.]: Illinois State Geological Survey.
MLA Citation
Busch, Willis L, and Illinois State Geological Survey. Directory of Illinois Mineral Producers. Urbana [Ill.]: Illinois State Geological Survey, 1968.
Warning: These citations may not always be complete (especially for serials).