This linen finish card was printed in 1950 by Curt Teich in Chicago. It was published by Bristol News Agency, Bristol Tenn. And that’s a lot of gassy prose on the back. Compare:
This card was published ten or so years later. It’s a modern chrome postcard printed by Haynes of Roanoke. While much terser, the wording the back is more atmospheric. The top one is a paragraph from a text book – this one is a clever sell piece. I don’t know how “mysterious” the cavern is, but the adjective gets the mood across.
Uncle Bob's Pix 