Flood frequency and culvert sizes needed for small watersheds in the central Appalachians / by J.D. Helvey.
|Main Author:||Helvey, J. D.|
[Broomall, Pa.?] : U.S. Dept. of Agriculture, Forest Service, 1981.
> Appalachian region.
Culverts > Appalachian region.
7 p. :
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