Actually both those links are to the same book I would not consider that book to be a reliable source on the permit as it states in the same paragraph that Tiber introduced the developer to Lang and we know that both Lang AND his partner AND Sam Yasgur AND Miriam Yasgur all dispute that Obviously Tiber was the source for both the permit and Yasgur claims He may well have had a permit but Id not state in Wikipedia as fact unless corroborated