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The archival record group at the Edison National Historical Park contains two series: a main run of general correspondence organized chronologically from 1915 through 1930 (boxes 1-20); and a smaller collection of subject folders (boxes 21-24) containing additional correspondence along with test reports, experimental notes, printed material, and other documents. Although the names of the folders in the archival record group reflect the original subject headings created by Edison and his secretaries, these names are occasionally misleading and many of the items within the folders do not fall under the stated subject. In addition, documents about a particular subject are sometimes scattered among several subject folders and related material can often be found as well in the general correspondence folders.
For these reasons, many of the documents selected for publication from the subject folders have been arranged with the general correspondence. In other cases, where information would be lost by separating the selected and unselected material, the selected items have been retained in their subject folders. However, closely related documents found in multiple subject folders have been consolidated into one folder. In some cases, the folder titles have been modified slightly in the editorial arrangement in order to differentiate between the vague and repetitive names originally given to them. In addition, subject folders for each year appear in the editorial arrangement immediately following the general correspondence for that year. It should be noted that there is still considerable overlap between the material in the subject and general correspondence folders, and both should be used in conjunction.
Numerous subject folders consisting entirely of documents unrelated to Edison have not been selected; a list of these folders appears below. In addition, several boxes in the archival record group have not been selected: boxes 25-27 (War Dept. Ordnance Bulletins and other printed material); box 28 (photocopies of correspondence owned by Charles Hummel; box 29 (photocopies of original documents filed elsewhere in the record group); and oversize material. A finding aid for the record group is available at the Edison National Historical Park.
