[Influences of Geographic Environment by Ellen Churchill Semple]@TWC D-Link bookInfluences of Geographic Environment
CHAPTER III
42/48
Oxford and New York, 1892.
[109] Roscher, _National-Oekonomik des Ackerbaues_, pp.
31, 52.
Stuttgart, 1888.
[110] _Ibid._, p.
56, Note 5.
[111] For these and other averages, Sir John Lubbock, Prehistoric Times, pp.
593-595.
New York, 1872.
[112] Roscher, _National-Oekonomik des Ackerbaues_, pp.
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