Valley of Mexico Archaeological Survey Project Collection Resources associated with the Valley of Mexico Archaeological Survey. Resources Inside This Collection (Viewing 1-5 of 5) There are 5 Coding Sheets within this Collection [remove this filter] Occupation Coding Sheet (Valley of Mexico) (2010) Period Coding Sheet (Valley of Mexico Project) (2010) Region Coding Sheet (Valley of Mexico) (2010) Subperiod I & II Coding Sheet (Valley of Mexico Project) (2010) Survey Code Coding Sheet (Valley of Mexico) (2010)