This folder contains correspondence, reports, and other documents from Samuel G. Burn, R. D. Casterline, and Theodore Lehmann, who were retained to survey domestic mining properties for Edison. The documents relate to properties in Maine, North Carolina, Pennsylvania, and Vermont.

Less than 10 percent of the documents have been selected. The following categories of documents have not been selected: reports receiving no significant reply by Edison; routine business correspondence regarding expense accounts and supplies; Burn's index of correspondence; mineral samples sent by Burn to Edison during the period November 1889-November 1892.