Sigmund Spaeth philosophy notes (HCS.003.027), Quaker & Special Collections, Haverford College, Haverford, PA.
Sigmund Spaeth philosophy notes (HCS.003.027), Quaker & Special Collections, Haverford College, Haverford, PA. https://archives.tricolib.brynmawr.edu//repositories/5/resources/9592 Accessed March 21, 2025.
