The Grolier Codex: A Preliminary Report on the Content and Authenticity of a Thirteenth-Century Maya Venus Almanac (1983) John B Carlson John B Carlson

https://www.academia.edu/6095636/The_Grolier_Codex_A_Preliminary_Report_on_the_Content_and_Authenticity_of_a_Thirteenth_Century_Maya_Venus_Almanac_1983_