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How and Why Wonder Book of Machines
by Dr. Jerome J. Notkin and Sidney Gulkin, illustrated by George J. Zaffo
from Charles E. Merrill Company
for 3rd-6th grade
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How and Why Wonder Book of Mathematics
by Esther Harris Highland and Harold Joseph Highland, illustrated by Walter Ferguson
from Charles E. Merrill Company
for 3rd-6th grade
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How and Why Wonder Book of North America
by Irving Robbin, illustrated by Darrell Sweet
Deluxe Edition
from Charles E. Merrill Company
for 3rd-6th grade
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How and Why Wonder Book of Winning of the West
by Felix Sutton, illustrated by Leonard Vosburgh
from Charles E. Merrill Company
for 3rd-6th grade
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