1. Chemist, Preservation Office Laboratory, Library of Congress, Washington, D.C.
2. Preservation of Rare Books and Manuscripts in the Huntington Library
3. Beckwith, T. D., Swanson, W. H., and Iiams, T. M. (1940), “Deterioration of Paper-The Cause and Effect of Foxing,” University of California at Los Angeles, Vol. 1, No. 13, pp. 299–356.