Zapata : introduction and background : portion of the typescript, undated [1949].

Apparently lacking p. 164, but this is simply a foliation error; not text is missing.
Dating: In June of 1945, Pan-American Films first contacted Steinbeck about writing a screenplay based on Emiliano Zapata. In the fall of 1948, following a trip to Mexico with Kazan, he wrote this long introduction "as a way of sinking into the material."--Cf. Parini, p. 293 and p. 329. This document was possibly prepared for submission to producer Darryl Zanuck.
Part of a collection of introductory and background material related to the film Viva Zapata!, which was produced by Twentieth Century-Fox in 1952.
The screenplay (together with the introduction) was first edited and published from the original held by the University of California at Los Angeles by Robert E. Morsberger in 1975.