1. University of Pennsylvania, Ms. Coll 390, Item 1925 DS ID: DS7542 Title: Siddhasiddhāntapaddhati Author: Gorakṣanātha Heiliger Date: circa 1700-1850.
2. University of Pennsylvania, Ms. Coll 390, Item 1928 DS ID: DS9033 Title: Rājayogāvivaraṇa Author: Gorakṣanātha Heiliger Date: circa 1700-1850.