Its mission is to "protect, preserve and interpret books, manuscripts and artifacts of the Schwenkfelders and the people of southeastern Pennsylvania in general and the Perkiomen Valley in particular.
The initial collection was part of an effort to gather the writings of the spiritualist reformer Kaspar Schwenkfeld von Ossig (1489–1561).
The Carnegie library, on the campus of The Perkiomen School, was designated to house on the upper floor the growing collection of books, manuscripts, and artifacts related to Schwenkfelder history.
This collection of writings resulted in the Corpus Schwenckfeldianorum (1907–1961), a nineteen-volume body of work containing Schwenckfeld's letters and books.
[8] In addition to the Corpus project, the library and archive collection includes, but is not limited to, local church and cemetery records, German and English newspapers, deeds and land draughts, family genealogies, the H. Winslow Fegley photograph collection, and Pennsylvania German prints and manuscripts.