Proto-language geo-coordinates based on:
- https://benjamins.com/catalog/dia.27.2.05wic
- https://www.researchgate.net/publication/216842292_Homelands_of_the_World's_Language_Families_A_Quantitative_Approach
Extracted from the PDF and transformed.
Citation:
@article{Wichmann2010,
author = {Wichmann, S{\o}ren and M{\"u}ller, Andr{\'e} and Velupillai, Viveka},
journal = {Diachronica},
number = {2},
pages = {247--276},
publisher = {John Benjamins},
title = {Homelands of the world's language families: A quantitative approach},
volume = {27},
year = {2010},
doi = {https://doi.org/10.1075/dia.27.2.05wic}