Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Том 91American Philosophical Society, 1947 |
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Сторінка 95
... plants and of their pathogens and pests is usually regional and not national ; consequently many of the problems connected with them are regional and interna- tional , regardless of any attempts to nationalize them . Plant diseases ...
... plants and of their pathogens and pests is usually regional and not national ; consequently many of the problems connected with them are regional and interna- tional , regardless of any attempts to nationalize them . Plant diseases ...
Сторінка 105
... Plant scientists have indeed col- laborated freely in exchanging plants and plant materials between all parts of the world . But they have often done it without realizing that man is one of the most effective agents of dis- semination ...
... Plant scientists have indeed col- laborated freely in exchanging plants and plant materials between all parts of the world . But they have often done it without realizing that man is one of the most effective agents of dis- semination ...
Сторінка 110
... plant diseases . Bull . Agr . Intelligence and Plant Diseases 3 : 2349-2354 . 13. EDSON , H. A. , JESSIE I. WOOD , and NELLIE W. NANCE . 1936. Estimates of crop losses from diseases in the United States in 1935. U. S. Dept. Agr ...
... plant diseases . Bull . Agr . Intelligence and Plant Diseases 3 : 2349-2354 . 13. EDSON , H. A. , JESSIE I. WOOD , and NELLIE W. NANCE . 1936. Estimates of crop losses from diseases in the United States in 1935. U. S. Dept. Agr ...
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Records of Courts of Common Law Especially of the Sessions of the Justices of the Peace | 258 |
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