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These ten notebooks, which are larger than the standard-size laboratory notebooks, served primarily as clean copy records, into which experimental plans and results were transcribed or in which data was tabulated. Three notebooks were used by Edison during the period 1902-1904 and annotated by him in later years. They contain compilations and transcriptions of notes and drawings on numerous topics, including batteries, electromotographs, phonographs, telephones, and other apparatus. There are also references to experiments concerning chemistry, electricity, magnetism, radiation, and thermodynamics. Six notebooks covering the period 1904-1911 consist of graphs representing the performance of batteries. The graphs were prepared from data collected by Walter E. Holland on experimental cells, Edison "E" and "A" type cells, and the batteries of competitors. Another notebook, used by Edison in 1907, contains tests on the solubility of lithium compounds.