Thanks a lot, I will check those out. Nicaragua is where I had my big adventure and will be climax of the book. I definitely want as much historical context as possible on Ortega, the Sandanistas, the Contras and Somoza. At one of the road blocks I had to talk my way through to escape the country - they asked me if I was a Contra. I knew the protestors were against the Sandinistas - but I decided to just play dumb as the most prudent course of action.
I'm about halfway done with Baja so far (which is pretty long but I realized I did a lot of stuff in Baja - plus the whole trip was so new).
Baja doesn't have anything like the history of Mesoamerica - but it does have some amazing cave paintings (supposedly one of the top 5 sites in the world for those). I've got these books so far:
Cave Paintings Of Baja California: Discovering the Great Murals of an Unknown People
Baja Legends: The Historic Characters, Events, and Locations That Put Baja California on the Map
Californio Portraits: Baja California's Vanishing Culture (Before Gold: California under Spain and Mexico Series)
And some books on the flora and fauna - mostly for the incredible cactii that exist nowhere else in the world.
Baja apparently was a backwater of the Spanish colonial ambitions for like 200 years - due to not much arable land, access to water, or exploitable resources. But w/o it none of the Rancho/Mission history of California (US) happens. The last book has some fascinating portraits of the Californos - hardscrabble Baja ranchers who made due off the land and pretty much lived the same way for 200 years, while the world industrialized around them.
I said in my blog at the time that Alaska is the only other place I've been which seemed more like nature was still winning over man.