We’ve mentioned before that we have a fondness for “…est” postcards:  their captions describing the tallest, biggest, oldest, whatever.  So here’s an unused Dexter Press card 72307-D whose caption tells us that the “free-flowing canal … combines the two lakes (Kentucky Lake and Barkley Lake) into the world’s largest man-made body of water for recreational activities”.  Now that’s specific.  Wonder if it’s still true?  Grade: 1