Source Data Reference for:
City = Piedras Negras
Time = 800
| City | Year | Size | Size Comment | Year Comment | Author | Title | Location |
|---|---|---|---|---|---|---|---|
| Piedras Negras | 800 | 30,000 | "btw 20,000 & 40,000" | Tertius Chandler | Four thousand years of urban growth | p39 | |
| Piedras Negras | 800 | top 6 in North America | Tertius Chandler | Four thousand years of urban growth | p528 |