A Field Guide To South Dakota Amphibians - free if bundled

A highly specific guide! If you happen to be in South Dakota, specifically, and need to identify an amphibious creature, specifically, this is the booklet that you, specifically, need! As someone who meets those criteria, I can say it's a nice booklet. But I have two. If you just want some nice pictures of frogs, this will also work for that! Free, if you bundle it with something else :)