CODES AND SECRET WRITING by Herbert S. Zim

CODES AND SECRET WRITING

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KIRKUS REVIEW

The qualities of simplicity, directness and logical organization that have made Zim's previous books so readable are present here, and should make this book a welcome addition to libraries, both public and school, for upper grades and high school. Readers will enjoy trying their hands at breaking secret codes and concocting invisible ink, and doing some of the other things for which directions are given. Diagrams.

Pub Date: Sept. 27th, 1948
Publisher: Morrow