These data on special numerals in South Asian languages were collected by Kumari Mamta. For about half of the languages, the data are also included in this work:

Mamta, Kumari. 2021. A typology of numeral systems in South-Asian languages. PhD dissertation, Jawaharlal Nehru University.

Fieldwork on the remaining languages was carried out in 2023-2024. Data on cardinal ("non-special") numerals are included in the Numeralbank database.