Author
SpringerLink (Online service)
8
United States. Department of Agriculture
5
Oxford Scholarship Online
4
Agricultural History Society
3
Colorado Historical Society. Office of Archaeology and Historic Preservation
3
EBSCOhost
3
Chesapeake and Ohio Canal National Historical Park (Agency : U.S.)
2
Lowdermilk, W. C. 1888-1974
2
National Register of Historic Places
2
Smith, Duane A.
2
SpringerLink (Online Service)
2
United States. Department of Agriculture. Economic Research Service
2
Wheelock, Perry Carpenter
2
Agnoletti, Mauro,
1
Aguilera Fernández, Eduardo,
1
Archer, Kenna Lang, 1982-
1
Bakels, C. C.
1
Banham, Debby, 1953-
1
Bazzurro, Alessandra,
1
Beeman, Randal S., 1963-
1
Bidwell, Percy W. 1888-1970
1
Bonnifield, Mathew Paul, 1937-
1
Borejsza, Aleksander, 1974-
1
Brassley, Paul, 1946-
1
CH2M HILL (Firm)
1
Campbell, Randolph B., 1940-
1
Carter, Vernon Gill, 1907-1989
1
Chŏn, Sŏng-ho, 1962-
1
Colorado. Department of Transportation
1
Cumo, Christopher,
1
Dale, Tom, 1899-1965
1
Danhof, Clarence H., 1911-
1
Donahue, Brian, 1955-
1
Evans, George Ewart
1
Faith, Rosamond, 1935-
1
Falconer, John I. 1888-1963
1
Fiore, Beatrice,
1
Fite, Gilbert C., 1918-2010
1
Frederick, Charles D.,
1
Fritz, Gayle,
1
García Ruiz, Roberto,
1
Gates, Paul W. 1901-1999
1
Ghosh, P. K.,
1
González de Molina, Manuel,
1
Guzmán Casado, Gloria I.,
1
Hancock, James F.,
1
Harvey, David,
1
Heiser, Charles B. 1920-2010
1
Historic American Buildings Survey/Historic American Engineering Record
1
Horwitz, Elinor Lander
1
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