This report deals with problems of keeping the documents in the Russian state library tied up with their storage condition. Cited are results of the observation of temperature, humidity, sanitary, hygienic, and light conditions of storage in depositories with unregulated climate. The report shows the stabilization and research of documents carried on by the research center of conservation of documents of the Russian state library to be insufficient for rehabilitating the documents which are constantly deteriorating under the influence of the environment in old depositories with unregulated climate. Reconstruction of the library's main depository of 19 tiers has begun. The report considers the difference between old depositories and those under reconstruction. The impact of the environment on the preservation of materials is analyzed. (Author/MES)