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1993 paper on squirrels and oaks: https://www.researchgate.net/publicat...

1991 paper on how traditional clay processing of acorns adsorbs tannic acid: https://academic.oup.com/ajcn/article...

2003 booklet on the Pomo people from the Hearst Museum of Anthropology at UC Berkley: https://hearstmuseum.berkeley.edu/wp-...