1631 was a year in the 17th century. Event Note: The following section is considered non-canon or is disputed in canonicity. Date unknown: Doc mentioned traveling here and having a drink from the Mississippi River as it was clean and pure at the time. Non-canon or disputable information ends here. Appearance The Earth Day Special (Mentioned only)(Non-canonical appearance) Reference ↑ The Earth Day Special Retrieved from "https://backtothefuture.fandom.com/wiki/1631?oldid=35501" Categories: Articles with non-canon elements Years Community content is available under CC-BY-SA unless otherwise noted.