[The Number Concept by Levi Leonard Conant]@TWC D-Link bookThe Number Concept
CHAPTER VII
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123.
[292] Wells, E.R., Jr., and John W.Kelly, Bureau of Ed., Circ.
of Inf., No.
2, 1890.
[293] Pott, _Zaehlmethode_, p.
57.
[294] Mueller, _Op.
cit._, II.i.p.
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