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Kemp maintained research files on bridge companies in Ohio and Pennsylvania. The box includes facsimile book excerpts, facsimile correspondence and facsimile handwritten notes. It also includes reports, engineering drawings and photographs. Subjects include bridge companies; concrete bridges; Spunky Bridge in Catoosa, Oklahoma; Phoenix Bridge in Eagle Rock, Virginia; and Luten Bridge Company. The following oversize item was moved to Box 342: 1 engineering drawing (undated). Two empty folders, "West Virginia Bridge Companies" and "Champion Bridge Companies—Wilmington, Ohio" were removed.

Kemp researched bridges across the United States as part of his restoration efforts and publications. The box includes facsimiles of the following: photographic prints, drawings, patent applications, and book excerpts. Also includes original photographs, slides, clippings and correspondence. Subjects include general bridges; covered bridges; mills; the patenting process for bridge technologies during the 1800s; Rideu Canal in Ottawa, Canada; St. Antonius de Padua Mission in Sacramento, California; Bridgeport Covered Bridge in Bridgeport, California; and buildings in Nevada City, California. The following oversized items were moved to Box 342: one clipping (1983), two engineering drawings (undated), and two sheets of facsimile book excerpts (undated).

Kemp conducted research on bridge patents. He may have been preparing for writing articles and books about bridge patents, including American Bridge Patents: The First Century (1790-1890). It includes correspondence, reports, floppy disks and facsimiles of the following: book excerpts, clippings, engineering drawings, and patent applications. Subjects include bridges, the patenting process, covered bridges, Burr truss bridges, bridge engineers and engineering developments. Correspondents include Richard Sanders Allen. The following oversized items were moved to Box 343: three sheets of a scholarly article (1857) and two sheets of engineering drawings (1857).

Materials were originally housed with Kemp's research on United States bridge patents, which may have been collected in preparation for articles and books including American Bridge Patents: The First Century (1790-1890). This box includes photographs, photo negatives, reports, and facsimile advertisements and directories. Subjects include bridges, the patenting process, patents housed at the Smithsonian, and bridge companies.

Kemp assisted in the transfer of an unnamed bridge in 1997, as well as preserving several other historic bridges. This box includes photographs, slides and photo negatives, as well as correspondence and facsimile drawings. Subjects include bridges over the Muskingum River, West Virginia bridges, and West Virginia covered bridges.

Kemp maintained research files about bridges and assisted in planning the historical marker about the Brownsville Cast Iron Arch Bridge (also called the Dunlap's Creek Bridge) in Brownsville, Pennsylvania. The box includes correspondence, photographic prints, photographic slides, scholarly journal articles, reports, student papers, event programs and newsletters. The box also includes the following facsimiles: correspondence, reports, photographs, journal articles, book excerpts, clippings and engineering drawings. Subjects include the Brownsville Cast Iron Arch Bridge, bridges of Europe and North America, engineering, railroad bridges, the history of bridge architecture in the United States and bridge construction. The following oversize items were moved to Map Cabinet 12, Drawer 11, Folder 4: one map (1987), ten sheets of clippings (1883-1885 and undated), and three engineering drawings (1987 and undated).

Kemp maintained research files on bridges in North America and Europe. The box includes reports, handwritten notes, clippings, correspondence, brochures, event programs, journal articles, and newsletters. The box also includes the following facsimile items: book excerpts, clippings, correspondence, journal articles and engineering drawings. Subjects include iron arch bridges; railroad bridges; French bridges; truss bridges; bridges in Quebec, Canada; bridges in Wisconsin, Washington, Iowa, Ohio, West Virginia, Pennsylvania, Maryland, Delaware, and Hawaii in the United States; bridge disasters; girders; and dams. The following oversize items were moved to Map Cabinet 12, Drawer 11, Folder 3: 15 sheets of clippings (1979-1983), 2 brochures (undated), 22 sheets of facsimile engineering drawings (1858-1983).

This box contains the following books:

Kemp researched Ohio canal commissioners for his publications and restoration projects. Contains facsimile index sheets, maps, government reports and court hearings. Subjects include canals, Ohio canals, Ohio public works, the Miami Conservancy District, etc. Organizations include the Board of Canal Commissioners for the Ohio Canal and the Board of Public Works of Ohio.

Kemp conducted research on canals. The box includes pamphlets, a postcard, a ticket, lecture notices, and bound copies of the United States Congressional Series Set. Subjects include canals, boats, dams, rivers, lock tender houses, Ohio, Pennsylvania, Canada and West Virginia. The following oversize items have been moved to Map Cabinet 12, Drawer 4, Folder 3: Fifty-four pamphlets (1971-1999 and undated), one map (undated), three newspapers (1975-1982).