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action of sulphur air-conditioning system alkaline alpha cellulose content American Library Association atmosphere book papers books stored brittle Bureau of Standards cause cellulose acetate Cellulose nitrate Chem chemical wood composed conditions in libraries copper number crude fibers decreased deterioration of paper discoloration dust effect of light elimination embrittlement emulsion exposed exposure of paper film folding endurance fumigant glue grades ground wood fibers heat test Huntington Library hydrogen-ion concentration impermanent papers increase insects Japanese tissue Kimberly leather librarians library air minimized mixture newspapers newsprint old books organic chemistry Oxidation percent relative humidity permanent record preservation of records quality of papers rag fibers record papers removal of sulphur rosin sheet showed stacks storage conditions storage spaces straw sulphur dioxide content sulphuric acid SURVEY OF STORAGE temperature and humidity temperature and relative tion treated treatment untreated wash water washed air wood pulp writing ink York Public Library