1. Preservation of Historical Records;National Materials Advisory Board,1986
2. Cultural Property and Air Pollution Damage to Monuments, Art-objects, Archives and Buildings Due to Air Pollution;Feenstra,1984
3. J.E. Yocom and N.S. Baer, in The Acidic Deposition Phenomenon and its Effects: Critical Assessment Review Papers, U.S. EPA, Washington, D.C. EPA-600/8–83–016BF, 1984, chapter E-7, section 7.1