1. Walter C. McCrone Associates, Appendix 4 in Horton, Carolyn,Cleaning and Preserving Bindings and Related Materials, 2nd Ed. American Library Association, Chicago, 1969, p. 64.
2. Paper Chromatography Laboratory Guide, Bulletin No. 201, 1977, Whatman, Inc., Clifton, N.J., p. 14. Whatman Chromatography #1 lacks uniform aging characteristics from roll to roll. Nelson, J.R. “Effects of Wash Water Quality on the Physical Properties of Three Papers,”Publication of the Art Conservation Training Programs Conference, N.Y., 1981.