http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
An hypothesis on Olmec astronomy, with special reference to the La Venta site, by M. P. Hatch.--The obsidian of Tres Zapotes, by T. R. Hester, R. N. Jack, and R. F. Heizer.--Technology and geologic sources of obsidian from Cerro de las Mesas, Veracruz, Mexico, with observations on Olmec trade, by T. R. Hester, R. F. Heizer, and R. N. Jack.--Non-classic inscriptions and sculptures at Seibal, by J. A. Graham.--A Maya hieroglyph incised on shell, by J. A. Graham.--Two unusual Maya stelae, by J. A. Graham and H. Williams.
Contributions of the University of California Archaeological Research Facility ; no. 13