| http://www.w3.org/ns/prov#value | - Nevertheless, the first efforts to establish favourableconditions for the preservation of large collections led authors such as H.J.Plenderleith to recommend certain levels of temperature, relativehumidity, and light, from the late 1940s onwards.During the 1960s these early articles were supplemented with others thatbegan to use the word ???standards??? in relation to preventive conservationmeasur
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