United States. Forest Service. (1939). Glued laminated wooden arch. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Forest Service. Glued Laminated Wooden Arch. [Washington]: [s.n.], 1939.
MLA (9th ed.) CitationUnited States. Forest Service. Glued Laminated Wooden Arch. [s.n.], 1939.
Warning: These citations may not always be 100% accurate.