From the wonderful blog of Futility Closet:
Several years later, they discovered Agloe on a Rand McNally map and confronted their competitor. But Rand was innocent: It had got the name from the county government, which had taken it from the Agloe General Store, which now occupied the intersection. The store had taken the name from a map by Esso, which had (apparently) copied it from Lindberg’s map. Agloe had somehow clambered from imagination into reality.