The collection consists of measured drawings, preliminary sketches, progress prints, working drawings and some correspondence for the restoration, retrofitting, or repair of a number of properties on the alley (mostly owned by the not-for-profit association) including the Elfreth’s Alley Association Museum located in a rowhouse on the alley, the public alley-way, and adjacent court, all located between Race and Arch Street, off Second Street, in Philadelphia. Includes the surveying, research, consultation, and/or design work of (in chronological order) D.W. Wetherhill Paint Company (n.d.), George A. Robbins, architect (1957 and 1965), Oskar Stonorov and S. Frank Haws, architects of record with Penelope Hartshorne, "restorationist" (1958-1959 and 1961), The Restoration Committee of the Elfreth Alley Association Inc., with Penelope Hartshorne (1959-1961), George D. Batcheler Jr., architect, and Penelope Hartshorne (1965-1966), Barton and Martin, engineers (1968), the Delta Group, design, architecture, and engineering (1975), and Fran Digian and Associates, landscape architects (1983). Also includes prints of a Historic American Building Survey (HABS) of the alley’s residences conducted in 1931. The survey includes drawings of all the building facades (as of 1931), some selected floor plans, and detail drawings of doors, windows, wood trim, fireplace mantels, and hardware, from a number of alley properties, all measured and/or drawn by C.E. Maule, P.B. MacLeod, and L.P. Polk. Restrictions:Opened for use by qualified researchers. Consult the Athenaeum’s Curator of Architecture for additional information. Provenance:This collection consists of the corporate architectural records of the Association along with the related drawings, notes, and correspondence of architect Penelope Hartshorne Batcheler, whom donated her Elfreth's Alley materials to the Association in 1990.