APA (7th ed.) Citation

Helvey, J. D. (1981). Flood frequency and culvert sizes needed for small watersheds in the central Appalachians. U.S. Dept. of Agriculture, Forest Service.

Chicago Style (17th ed.) Citation

Helvey, J. D. Flood Frequency and Culvert Sizes Needed for Small Watersheds in the Central Appalachians. [Broomall, Pa.]: U.S. Dept. of Agriculture, Forest Service, 1981.

MLA (9th ed.) Citation

Helvey, J. D. Flood Frequency and Culvert Sizes Needed for Small Watersheds in the Central Appalachians. U.S. Dept. of Agriculture, Forest Service, 1981.