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Canals

Fon W. Boardman (Jr.)

出版	Henry Z. Walck, Incorporated, 1959
URL	http://books.google.com.hk/books?id=uw9SAAAAMAAJ&hl=&source=gbs_api

註釋

From prehistoric irrigation ditches to the Panama canal, this history of inland waterways describes how and why canals are built and their importance to civilization. Grades 6-8.