Public domain
The air raid protective services. Auxiliary police number among their most important duties the guarding of various points where saboteurs might hope to operate. Gas tanks, power houses, telephone exchanges and water works are attractive places for anyone bent on sabotage.
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineThe air raid protective services. Auxiliary police number among their most important duties the guarding of various points where saboteurs might hope to operate. Gas tanks, power houses, telephone exc. 1941-01-01. United States. Office For Emergency Management, Hollem, Howard R.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.