Thank you for the response, Ajit mahodaya.
VV Indological Series is an abbreviation due to character constraints on MS Excel. I'll see if I can rectify that in Google sheets, but as such, it is meant to be a shorthand for the Vishveshvaranand Indological Series.
Also, you'll be seeing many numbers skipped over, and not just in this series, and that is because these skipped numbers are generally studies without any accompanying Sanskrit primary sources. On the other hand, they may not be works in Sanskrit, whether these works be a Sanskrit translation of a non Sanskrit work. I have skipped Shantakuti Vedic series because it consists only of Indices, and no primary sources. The numbers skipped in Woolner Indological series are all studies and are not primary sources, which is why they were not mentioned.
Also, this work is perpetually in progress, as long as Sanskrit works are published across the world, so new series will be added in the future, once the details are obtained
Kind regards,
Abhaya Rathore