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The preservation of historic barns

Auer, Michael.
Washington, D.C. : Technical Preservation Services, National Park Service, U.S. Dept. of the Interior, [1989] 1989

The preservation of historic signs

Auer, Michael, author.
Washington, D.C. : U.S. Department of the Interior, National Park Service, Cultural Resources, Preservation Assistance, 1991. 1991

The preservation of historic signs

Auer, Michael.
[Washington, D.C.] : U.S. Dept. of the Interior, National Park Service, Cultural Resources, Preservation Assistance : [Supt. of Docs., U.S. G.P.O., distributor, 1991] 1991