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Physical Properties of Dental Materials II* * Printed by permission of the Director, Bureau of Standards. * The cooperative research by the Bureau of Standards and the Weinstein Research Laboratories reported in this paper was planned jointly by Louis J. Weinstein, director of the Weinstein Research Laboratories, and Wilmer Souder, physicist, of the Bureau of Standards, who is actively in charge of this work. Their continued aid throughout has been essential to its success. Dr. Weinstein, by reason of his pioneer work and long experience in this field, has been able to contribute valuable aid on the dental problems involved. Dr. Souder directed the scientific phases of the research. Acknowledgment is also made of their assistance in interpreting the results and preparing the material for publication.
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