Foundation for the Advancement of Mesoamerican Studies
Famsi: Classic Maya Borders and Frontiers (2003)
A look at the geology and topography of El Paraiso valley and its influence on communication, passage and trade. Report also considers architecture and "Mayanization" of area.
Foundation for the Advancement of Mesoamerican Studies
Famsi: Sacred Landscapes and Social Memory Ndaxagua Tunnel
PDF report on Ndaxagua Natural Tunnel in Oaxaca, Mexico. Included are photographs and drawings (some calendar) of cave markings thought to be Chocho, Popoloca, and Mixtec cultures.