| Clue | Source | Date |
|---|---|---|
| Southern Mexican Indian | ||
| Pre-Columbian civilization of Oaxaca | Wall Street Journal | 28 Sep 2019 |
| Pre-Columbian civilization of Oaxaca | ||
| Oaxacan civilization | Wall Street Journal | 26 Aug 2017 |
| Sleuth going after vitality, old, of early Mexican | ||
| Mesoamerican language with 400,000+ speakers | New York Times | 26 Dec 2015 |
| People of Oaxaca Valley, Mexico | New York Times | 09 Sep 2015 |
| People of Oaxaca Valley, Mexico | ||
| Mesoamerican language with 400,000+ speakers | ||
| Mexican Indian | ||
| Mexican Indian |