Introduction to the Special Section: Borders, Frontiers, and Boundaries in the Maya World: Concepts and Theory, Christina Halperin and Carolyn Freiwald

Early isotopic evidence for maize as a staple grain in the Americas, Douglas J. Kennett, Keith M. Prufer, Gyles Iannone, Brendan J. Culleton, Richard J. George, Mark Robinson, Willa R. Trask, Gina M. Buckley, Emily Moes, Emily J. Kate, Thomas K. Harper, Lexi O'Donnell, Erin E. Ray, Ethan C. Hill, Asia Alsgaard, Christopher Merriman, Clayton Meredith, Heather J. H. Edgar, Jaime J. Awe, and Said M. Gutierrez