61. University of Pennsylvania, Ms. Coll 390, Item 1122 Title: Vākyavr̥tti Author: Ādi Shankara Date: 1876.
68. University of Pennsylvania, Ms. Coll 390, Item 1152 Title: Īśopaniṣadbhāṣya Author: Ādi Shankara Date: circa 1700-1850.