02110oam 2200577 450 991071694780332120211117085119.0(CKB)5470000002526718(OCoLC)681322949(OCoLC)624342404(OCoLC)979947773(EXLCZ)99547000000252671820101115d1992 ua 0engurbn|||||||||txtrdacontentcrdamediacrrdacarrierWater soak cleaning of limestone the Widener Building, Philadelphia, Pennsylvania /Robert M. Powers[Washington, D.C.] :U.S. Department of the Interior, National Park Service, Cultural Resources, Preservation Assistance Division,1992.1 online resource (6 pages) illustrationsPreservation tech notes,0741-9023 ;PTN-37.Masonry ;no. 3"August 1992"--Page 6.Water soak cleaning of limestone CornicesMaintenance and repairConcrete masonryHistoric buildingsConservation and restorationPennsylvaniaPhiladelphiaConcrete masonryfastCornicesMaintenance and repairfastHistoric buildingsConservation and restorationfastPennsylvaniaPhiladelphiafastCornicesMaintenance and repair.Concrete masonry.Historic buildingsConservation and restorationConcrete masonry.CornicesMaintenance and repair.Historic buildingsConservation and restoration.Powers Robert M.1955-1416736United States.National Park Service.Preservation Assistance Division,OCLCEOCLCEOCLCQOCLCFOCLCQOCLCOOCLCQCSFOCLCAGPOBOOK9910716947803321Water soak cleaning of limestone3523019UNINA