There are so few podcasts listed they do not bother having any categorization. It's just a page listing the few podcasts.
As of this writing something is very wrong with the formatting and the page display is totally screwed up.
The topics covered by the few podcasts are fishing, hunting, hiking, y'know, enjoyment of the great outdoors. Maybe there aren't too many of these podcasts because podcasters spend their time in front of computers?