Natural aggregate :
building America's future /
by William H. Langer and V.M. Glanzman.
APA Citation
Langer, W. H., Glanzman, V. M., Geological Survey (U.S.). (1993). Natural aggregate: building America's future. Washington: U.S. G.P.O. .
MLA Citation
Langer, William H, V. M Glanzman, and Geological Survey (U.S.). Natural Aggregate: Building America's Future. Washington: U.S. G.P.O. , 1993.
Warning: These citations may not always be complete (especially for serials).