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13
Yearbook of Agriculture, 1938
United States congressional serial set ; serial set no. 10192;House document / 75th Congress, 2nd session. House ; no. 398
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14
Inverse and Improperly Posed Problems in Differential Equat..
Proceedings of the Conference on Mathematical and Numerical...
Mathematical Research ; 1, Mathematische Forschung
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15
Proceedings of the Ninth International Colloquium on Differ..
Plovdiv, Bulgaria, 18–23 August, 1998