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MLA

Yarnell, David L. (David Leroy). "Bridge Piers As Channel Obstructions." , p.,. Print

APA

Yarnell, D. L. (David Leroy). (1934). Bridge piers as channel obstructions.

Chicago

Yarnell, David L. (David Leroy) "Bridge piers as channel obstructions" (0000): p.,.