Two 1934 & 1940 National Geographic Maps of the United States & Central America

The USA map is slightly taller than the Central America map. There is a lot of damage to the outer sides of the maps, especially to the USA map. But for the most part the totality of the pieces are unmarked. There looks like some small paint splatters on the USA map. As I bought these from a garage sale, they looked to be stored in the garage by their past owners. The Mexico map has an old wire string to hang, but the USA map does not. The Central America map has the copyright listed with 1934 next to it. The USA map has the same copyright but the date is 1940. They do have scratches, dents and marks. They are placed on some sort of wooden board. Perhaps they were once used in a school? I'm not sure. I wanted to find out what they were worth, since I also assume they are worth more than the 50 cents a piece I paid for them.