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Copyright 1980 National Association of Biology Teachers
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Ralph Troll; Review: Laboratory Studies of Chick, Pig, and Frog Embryos, by Ray L. Watterson, Gary C. Schoenwolf, and Robert M. Sweeney. The American Biology Teacher 1 March 1980; 42 (3): 192. doi: https://doi.org/10.2307/4446890
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