. Yam culture in Porto Rico . Fig. I.—Variety Test of Yams, Ridge Culture, Porto Rico Fig. 2.—Specimens of Guinea Yams (Dioscorea sativa). Bui. 27, Porto Rico Agr. Expt. Station. Plate II

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Keywords: ., bookcentury1900, bookdecade1920, bookidyamcult00uni, bookyear1921