| Agriculture - 1979 - 516 pages
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| Agriculture - 1967 - 506 pages
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| Robert Maxwell Young - Great Britain - 1971 - 372 pages
...passage contains Darwin's reply to the problems with which the rest of this essay will be concerned. Several writers have misapprehended or objected to...have even imagined that natural selection induces vanability, whereas it implies only the preservation of such variations as anse and are beneficial... | |
| Agriculture - 1985 - 456 pages
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| Jordi Fuentes - 1998 - 173 pages
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