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Franz von Lichtenberg and Lawrence S. Ritchie
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Myron G. Radke, Lawrence S. Ritchie, and Frederick F. Ferguson
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Lawrence S. Ritchie, Alfred Hernandez, and Ricardo Rosa-Amador
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Lawrence S. Ritchie, Luis A. Berrios-Duran, and Robert Deweese
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Wilda B. Knight, Lawrence S. Ritchie, Félix Liard, and Jorge Chiriboga
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Jorge Chiriboga, Lawrence S. Ritchie, José Oliver-González, Raymond Brown, and Víctor A. López
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Schistosoma Mansoni in Macaca Mulatta

Long-term Studies on the Course of Primary and Challenge Infections

Donald B. McMullen, Lawrence S. Ritchie, Jose Oliver-González, and Wilda B. Knight
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