Add data from Collard et al. 2013

[joeroe]

Dataset on technological richness (presence/absence of a variety of material culture types and other technological traits).

• Collard, M., Buchanan, B., O’Brien, M.J., Scholnick, J., 2013. Risk, mobility or population size? Drivers of technological richness among contact-period western North American hunter-gatherers. Philos. Trans. R. Soc. Lond. B Biol. Sci. 368, 20120412. https://doi.org/10.1098/rstb.2012.0412

The original data is extracted from:

• Jorgenson JG. 1980. Western Indians: comparative environments, languages and cultures of 172 Western American Indian tribes. San Francisco, CA: Freeman.