Describes the status of several preservation projects as well as recent progress in the diethyl zinc (DEZ) mass deacidification program. The DEZ Pilot Plant Testing program has been completed; research on the toxicity of zinc oxide continues. Other projects examined involve research on deacidification of paper, and include: determination of optimal alkaline reserve; comparison of aqueous and nonaqueous deacidification processes; comparison of calcium, magnesium, and zinc-based deacidification systems; effects on pigment colors and resistance to biological attack. A section on other chemical treatments covers the status of research on postfumigation release of ethylene oxide and the Parylene paper strengthening process. Environmental control issues studied include the effect of contained environments on the stability of paper, and other materials, particularly the effect of relative humidity. The effect of paper composition on its stability is examined, particularly the effect of deacidification agents on papers contaminated with traces of copper species influence of lignin content on the aging of paper was also discussed. Other projects are grouped under the heading of analysis and testing of library materials, and four are described.