1982 National Register of Historic Places Inventory for Colonial Germantown Historic District:
"Joseph Jacob House, c. 1810; first floor alterations c 1900 ff., three and one-half stories, stucco with wood trim Colonial/Federal styles. --- Contributing."

Additional Sources:

• GHS: Historic Buildings Box 1, folder "Germantown Ave. A Century Ago, 1955:" "No. 32 in a Series" (newsclipping with following text as well as image of Blanche Day photo print no. 58 listed at GHS in Photo Scrapbook 6--see below):

  "From the rear, these old houses on the southwest look like a picturesque scene in an ancient foreign town. From the front, however, all is bustle and commerce. Half a dozen small shops occupy the premises from 5918 to 5922 Germantown Avenue, which were originally built by A. Keyser before the Revolutionary War."

• GHS: Jellett, Edwin C. "Germantown Historical Miscellany," p. 238: panoramic view of Germantown Avenue south of Haines (1906 post card).

• GHS: Johnson, George Clarence, compiler. Pictorial Germantown Road & the Vicinity & Some of its Inhabitants, vol. 2, p. 91: Joseph Jacob house c. 1810 (text and photograph).

• GHS: Keyser, Naaman. Notes for v. 2 (north of Chelten), History of Old Germantown, p. 34 (unpublished typewritten manuscript).

• GHS: Photo Scrapbook 6 "Germantowne 100 Years Ago" (1955), compiled and presented by Blanche Day: no. 58 (photograph of the rear of 5918-5922 Germantown Ave. viewed from West Haines Street).

• HSP: Campbell Collection (Compiled by Jane Campbell, circa 1900-1910), vol. 33, p. 192: panorama of Germantown Avenue below Haines beginning with 5926 Germantown Avenue.