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Google圖書搜尋
THe Desert Milkweed, Asclepias Subulata, as a Possible Source of Rubber
Ralph Edwin Beckett
Robert S. Stitt
出版
U.S. Government Printing Office
, 1935
URL
http://books.google.com.hk/books?id=6CcDaAEACAAJ&hl=&source=gbs_api