The book How to Shit in the Woods : An Environmentally Sound Approach to a Lost Art, by Kathleen Meyer is just what the title sounds like: a book on defecation, urination, and even menstruation for people going someplace where there aren't the kind of bathrooms they are used to. The author says in the introduction: "My aim was twofold: first, to offer badly needed succor to backcountry travelers struggling with things like balance, bugs, embarrassment, and yellowing tennis shoes (I often encountered neophyte rafters who without the bathroom door to close and lock behind them opted for a week of cramps and constipation); and second, to provide practical and environmental methods for keeping wild places pristine, esthetically and bacterially." It doesn't sound like anyone could write a whole book on the subject, but apparently there's a lot more to it than the node how to take a shit outside has; what I saw of the book doesn't seem to be filler, and all the reviews I've read have been positive.