Chapter 8

[A]The authors are indebted to many persons for furnishing samples for testing and for making duplicate tests. This cooperation is gratefully acknowledged with thanks.

[A]The authors are indebted to many persons for furnishing samples for testing and for making duplicate tests. This cooperation is gratefully acknowledged with thanks.

[A]The authors are indebted to many persons for furnishing samples for testing and for making duplicate tests. This cooperation is gratefully acknowledged with thanks.

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THE CORSE PRESS, Inc.,

Sandy Creek, N. Y.


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