. Collier's new encyclopedia : a loose-leaf and self-revising reference work ... with 515 illustrations and ninety-six maps. ©Ewiitg Calloway PLOWING AN ALFALFA FIELD BY TRACTOR. Keystone Iiew Coinj^aiiy PRIMITIVE AGRICULTURE ON THE NILE

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Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1921