Machines at Work
by Mary Elting
Publisher: Harvey House 1962
Number of pages: 100
People have always been able to work and build wonderful things, using just their muscles. And they can do a very great deal more when they use their brains, too. They can invent machines to make work thousands of times easier and faster.
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by Theodore Wood - The University Society
This volume is a sketch of the animal life of the whole world. The author has so skilfully selected his examples to illustrate both the natural groups and the faunas, that his work forms a most commendable plan for the study of natural history.
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