Public domain
Defense housing, Erie, Pennsylvania. A built-up roofing is applied to the individual unit. Here a workman tends to the vat in which the pitch is kept molten. Pitch is hoisted to the roof in buckets
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineDefense housing, Erie, Pennsylvania. A built-up roofing is applied to the individual unit. Here a workman tends to the vat in which the pitch is kept molten. Pitch is hoisted to the roof in buckets. 1941-01-01. United States. Office For Emergency Management, Palmer, Alfred T.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.