Books by McGavack, John
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Guppies, bubbles, and vibrating objects;: A creative approach to the teaching of science to very young children
Author(s): McGavack, John
ISBN-13: 9780381970260
The Adsorption of Sulfur Dioxide by the Gel of Silicic Acid
Author(s): McGavack, John
ISBN-13: 9781116918366