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1976
Pfister, Robert E., Paul E. Donheffner, Thomas Edward Hartsook, and Oregon. State Marine Board. Pleasure boating in Oregon : a report to the Oregon State Marine Board In WRRI (Series). Vol. no.42. Corvallis, Or.: Oregon State University. Water Resources Research Institute, 1976.
→ ir.library.oregonstate.edu/concern/defaults/76537521k