1
2
gan Feaster, J. Gerald.
Cyhoeddwyd 1973
“...United States. Department of Agriculture. Economic Research Service....”Cyhoeddwyd 1973
Llyfr
3
gan Frey, Henry Thomas, 1927-.
Cyhoeddwyd 1973
“...United States. Department of Agriculture. Economic Research Service....”Cyhoeddwyd 1973
Llyfr
4
gan Krause, Orville E.
Cyhoeddwyd 1970
“...United States. Department of Agriculture. Economic Research Service....”Cyhoeddwyd 1970
Llyfr
5
gan Holtman, J. B.
Cyhoeddwyd 1974
“...United States. Department of Agriculture. Economic Research Service....”Cyhoeddwyd 1974
Llyfr
6
gan Scofield, William H.
Cyhoeddwyd 1968
“...United States. Department of Agriculture. Economic Research Service....”Cyhoeddwyd 1968
Llyfr
7
gan Coffman, George W.
Cyhoeddwyd 1969
“...United States. Department of Agriculture. Economic Research Service....”Cyhoeddwyd 1969
Llyfr
8
Cyhoeddwyd 1975
“...United States. Department of Agriculture. Economic Research Service....”
Llyfr
9
Cyhoeddwyd 1970
“...United States. Department of Agriculture. Economic Research Service....”
Llyfr
10
Cyhoeddwyd 1969
“...United States. Department of Agriculture. Economic Research Service....”
Llyfr
11
gan Smith, Edward Joseph, 1911-.
Cyhoeddwyd 1969
“...United States. Department of Agriculture. Economic Research Service....”Cyhoeddwyd 1969
Llyfr
12
Cyhoeddwyd 1973
“...United States. Department of Agriculture. Economic Research Service....”
Llyfr
13
Cyhoeddwyd 1970
“...United States. Department of Agriculture. Economic Research Service....”
Llyfr
14
gan Blake, Helen Therese, 1922-.
Cyhoeddwyd 1975
“...United States. Department of Agriculture. Economic Research Service....”Cyhoeddwyd 1975
Llyfr
15
gan Edwards, Clark, 1926-.
Cyhoeddwyd 1975
“...United States. Department of Agriculture. Economic Research Service....”Cyhoeddwyd 1975
Llyfr
16
gan Fuguitt, Glenn Victor, 1928-.
Cyhoeddwyd 1976
“...United States. Department of Agriculture. Economic Research Service....”Cyhoeddwyd 1976
Llyfr
17
Cyhoeddwyd 1973
“...United States. Department of Agriculture. Economic Research Service....”
Llyfr
18
gan Myrick, D. C.
Cyhoeddwyd 1971
“...United States. Department of Agriculture. Economic Research Service....”Cyhoeddwyd 1971
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19
gan Rojko, Anthony Stanley, 1918-.
Cyhoeddwyd 1970
“...United States. Department of Agriculture. Economic Research Service....”Cyhoeddwyd 1970
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20
gan Regier, Donald Wilson, 1918-.
Cyhoeddwyd 1970
“...United States. Department of Agriculture. Economic Research Service....”Cyhoeddwyd 1970
Llyfr