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Titlebook: Hydrography and Navigation on the Congo River; A Century of Visual Paul Van Pul Book 2023 The Editor(s) (if applicable) and The Author(s),

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發(fā)表于 2025-3-25 07:02:49 | 只看該作者
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發(fā)表于 2025-3-25 09:17:21 | 只看該作者
Paul Van Pulargely resultant disturbances and pollution of the environment in which man must live and produce the things he needs, are forcing him to search for means of solving the first problem without intensifying the latter. Food production requires adequate assurance against the ravages of insects. In the
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發(fā)表于 2025-3-25 13:23:16 | 只看該作者
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發(fā)表于 2025-3-25 17:40:36 | 只看該作者
Paul Van Pulargely resultant disturbances and pollution of the environment in which man must live and produce the things he needs, are forcing him to search for means of solving the first problem without intensifying the latter. Food production requires adequate assurance against the ravages of insects. In the
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發(fā)表于 2025-3-25 20:41:01 | 只看該作者
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發(fā)表于 2025-3-26 02:28:28 | 只看該作者
Paul Van Pulultant disturbances and pollution of the environment in which man must live and produce the things he needs, are forcing him to search for means of solving the first problem without intensifying the latter. Food production requires adequate assurance against the ravages of insects. In the last three
27#
發(fā)表于 2025-3-26 04:47:42 | 只看該作者
Paul Van Pulnts which subsequently become “weeds.” In the United States the losses caused by alien and native weeds are believed to equal the combined losses from insects and diseases and to rank second only to those caused by soil erosion (Saunders . King, 1966). For the decade ending in 1960, this meant an an
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發(fā)表于 2025-3-26 11:12:39 | 只看該作者
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發(fā)表于 2025-3-26 12:37:04 | 只看該作者
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