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PLAIN TRUTH July-August 1973
HARVESTING WHEAT
with o
McCormick combine in Oklo–
homo (left) requires 250 uni ts
of fuel energy for every
50
units of crop (meosured in BTU's)
horvested, whereos on efficient
Filipino former produces
50
units
of crop for eoch single unit of
human energy (below).
Top, Jorry Gentry
-
Plain Truth
Bottom, Joseph Cloyton
_:_
Ploin Trulh
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