Collins, C. A., & Broad, T. M. (1994). Estimated average annual ground-water pumpage in the Portland Basin, Oregon and Washington 1987-88. U.S. Geological Survey.
Chicago Style (17th ed.) CitationCollins, C. A., and Tyson M. Broad. Estimated Average Annual Ground-water Pumpage in the Portland Basin, Oregon and Washington 1987-88. Portland, Oregon: U.S. Geological Survey, 1994.
MLA (9th ed.) CitationCollins, C. A., and Tyson M. Broad. Estimated Average Annual Ground-water Pumpage in the Portland Basin, Oregon and Washington 1987-88. U.S. Geological Survey, 1994.
Warning: These citations may not always be 100% accurate.