de Lada Kratky, Nancy Frey, Nonie K. Lesaux, Deborah J Short, Sylvia Linan Thompson
National Geographic School Publishing, Incorporated · inglés · ISBN 9781305840263
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National Geographic School Pub · ISBN 9780736298070
National Geographic School Publishing, Incorporated · inglés · ISBN 9780736297998
National Geographic School Publishing, Incorporated · inglés · ISBN 9780736298186
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