Wireless Networking in the Developing World was a good read: http://www.wndw.net/
The Free Network Foundation has aggregated a lot of practical info: https://commons.thefnf.org/index.php/Portal:Education
A link from the FNF on multi-hop optimization: http://researchrepository.murdoch.edu.au/3982/1/Comparison_o...)
The motherboard documentary about the FNF is a must watch for any mesh network enthusiast: https://www.youtube.com/watch?v=Fx93WJPCCGs