Potomac Electric Power Co. substations. Substation no. 38 transformer enclosure I

Public domain photograph of building construction site, free to use, no copyright restrictions image - Picryl description

public utility companies washington region acetate negatives horydczak collection theodor horydczak photo substations potomac electric power transformer enclosure library of congress

01/01/1920

Library of Congress

https://www.loc.gov/

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