I would be very grateful if someone happened to have a PDF copy of the following and were willing to share it:

David Pingree, "The Paitāmaha-siddhānta of the Viṣṇudharmottarapurāṇa,” Adyar Library Bulletin 31-32 (Dr. Raghavan Felicitation Volume), 1967-1968, pp. 472-510.