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These five notebooks cover the period July-September 1887, with intermittent entries from 1889, 1890, 1892-1894, and 1898. The books contain material relating to various administrative matters at the West Orange laboratory. Included are items pertaining to construction of the laboratory, the Llewellyn Park electrical system, technical books and journals, and labor records. Most of the material is by unidentified storekeepers and office personnel. Only one book has been selected: a detailed journal regarding construction of the laboratory that notes several on-site inspections by Edison.