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1936
Williams, Gerald W.. Mott Bridge Crossing the North Umpqua River at Steamboat [archival photograph] In Gerald W. Williams Collection., 1936.
→ oregondigital.org/concern/images/df66ts379
1930
Williams, Gerald W.. Booth Bridge overlooking dam and powerhouse [archival photograph] In Gerald W. Williams Collection., 1930.
→ oregondigital.org/concern/images/df66ts646
Jones, Benjamin Earl, and Harold Thornton Stearns. Water-power resources of the Umpqua River and its tributaries, Oregon In Water-Supply Paper (Washington, D.C.). Reston, Va.: U.S. Geological Survey, 1930.
→ pubs.usgs.gov/wsp/0636f/report.pdf
1928
Oregon Secretary of State.,. Umpqua River Water and Fish Bill In Oregon. Office of the Secretary of State. Voters pamphlet. Salem, Or., 1928.
→ library.state.or.us/repository/2010/201003011350161/ORVPGenMari1928m.pdf
1926
U.S. Geological Survey. Plan and profile of Umpqua River above Scottsburg, Oregon, North Umpqua River and tributaries [cartographic material]., 1926.
1925
Oregon. State Engineer, and U.S. Geological Survey. Water resources of the state of Oregon: summary of available information 1914-1924 : Umpqua, Coquille In Bulletin / Oregon State Engineer. Salem, Or.: State Printing Dept., 1925.
1915
Marshall, R. B.. Profile surveys in 1914 in Umpqua River Basin, Oregon, prepared under the direction of R.B. Marshall, chief geographer; prepared in cooperation with the state of Oregon, John H. Lewis, state engineer In Water-Supply Paper (Washington, D.C.). Vol. no. 379. Washington, D.C.: Government Printing Office, 1915.
→ www.archive.org/details/profilesurveysin02mars
Henshaw, Fred F., Henry Jennings Dean, and Oregon. State Engineer. Surface water supply of Oregon: 1878-1910 In Geological Survey Water-Supply Paper. Vol. no.370. Washington, D.C.: Government Printing Office, 1915.
→ archive.org/download/surfacewatersupp00hens/surfacewatersupp00hens.pdf
1914
Grover, Nathan Clifford, Fred Forbes Henshaw, and U.S. Geological Survey. Surface water supply of the United States, 1912. Part XII, North Pacific coast drainage basins. C, Lower Columbia River and Rogue, Umpqua, and Siletz rivers / Prepared in cooperation with the States of Oregon and Washington In Geological Survey water-supply paper. Washington, D.C.: U.S. Govt. Print. Off, 1914.
1910
Williams, Gerald W.. Roseburg Dam and Bridge [archival photograph] In Gerald W. Williams Collection., 1910.
→ oregondigital.org/concern/images/df66ts514

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