This just in from Steve Maslowski, son of one of Disney True-Life Adventures cinematographers, Karl Maslowski:

[Attached are three photos - one which shows my father with Walt; another shows my father with a woman in a boat taken during the filming of an old show called "Secrets of Earthquake Lake" at Reelfoot Lake in Tennessee. The woman apparently was one of the stars. A third photo shows my father a few years earlier in the same area on his way to build a tower to photograph nesting egrets. If I remember right, some of the film Dad shot then was subsequently used in Secrets of Earthquake Lake.]