Water soak cleaning of limestone
Subtitle: the Widener Building, Philadelphia, Pennsylvania
By: Robert M. Powers
Contributors: United States. National Park Service. Preservation Assistance Division
Series: Preservation tech notes -- PTN-37. -- Masonry -- no. 3; Preservation tech notes -- PTN-37; Preservation tech notes -- no. 3
Publisher: U.S. Dept. of the Interior, National Park Service, Cultural Resources, Preservation Assistance Division
Published: 1992
Place of publication: [Washington, D.C.] (P.O. Box 37127, Washington 20013-7127)
Language: eng
Subjects: Cornices -- Maintenance and repair; Concrete masonry; Historic buildings -- Conservation and restoration -- Pennsylvania -- Philadelphia
Notes: Caption title

Shipping list no.: 92-0608-P

"August 1992"--P. 6