638. University of Pennsylvania, Ms. Coll 390, Item 2763 Title: Āśvalāyanaśrautasūtra Date: circa 1700-1850.
639. University of Pennsylvania, Ms. Coll 390, Item 2768 Title: Kātyāyanaśrautasūtra Author: Kātyāyana Date: circa 1700-1850.
640. University of Pennsylvania, Ms. Coll 390, Item 2770 Title: Kātyāyanaśrautasūtra Author: Kātyāyana Date: circa 1650-1799.