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Tales of whales, turtles, sharks and snails: An elementary level educational handbook
Author: Jay R Calkins   ISBN: B0006P2CRI   /   Unknown Binding Publisher: University of Georgia Marine Extension Service   /   1992
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Gray's Reef National Marine Sanctuary: An educational handbook
Author: Jay R Calkins   ISBN: B000726CYO   /   Unknown Binding Publisher: University of Georgia, Marine Extension Service   /   1987
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