Carta del historiador Charles Gibson, fechada en Ann Arbor University.
Your magnificent, very impressive four volumes of Quetzalcoatl et Guadalupe arrived in the late summer when I was away (…)
How generous you consider me “lecteur numéro I†of the Manuscrit Tovar.
I eagerly look forward to receiving and reading it. (…)
With renewed thanks, and very best wishes for the New Year.
 Cordially yoursÂ
Rúbrica
Charles Gibson.
[December 28, 1971]