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Hookworm disease and how to prevent it / Metropolitan Life Insurance Company.

The study of an area in the mountains of Porto Rico, which had been influenced for twenty years by hookworm control measures / by William W. Cort, William A. Riley and George C. Payne.

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Necatoriasis - prevention & control

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Hookworm disease and how to prevent it / Metropolitan Life Insurance Company.

The study of an area in the mountains of Porto Rico, which had been influenced for twenty years by hookworm control measures / by William W. Cort, William A. Riley and George C. Payne.