The final CIW field project took place in July of 1950, in the Maya region of Mayapán, where extensive and detailed investigations were conducted for five years. To ensure the rapid dissemination of the results of the Mayapán Project, two series of papers described the work being undertaken and reported the preliminary findings. These were volumes 50 through 57 of the Year Books and numbers 1 through 41 of the Current Reports. A total of forty one Current Reports were published by the Carnegie Institution of Washington from 1952 to 1957. All of these are reproduced in The Carnegie Maya II, accompanied by an introduction by John Weeks, a forward by Marilyn Masson, and a summary table of data compiled by Marilyn Masson regarding artifacts unearthed at Mayapán.