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From the Archive of Urantia Brotherhood:
Fundamentals of The Urantia Papers -- Collected study aids from "The Seventy" and the early years of Urantia Brotherhood, 1943-1960 -- Various notes and diagrams as collected by Marian Rowley.
Notes on Dissemination -- Bill Sadler, 1948.
The Master Universe Hypothesis: A Presentation of Speculative Thinking -- First rough draft of "A Study of The Master Universe"; Bill Sadler, 1956.
A Study of The Master Universe -- Later working draft; Bill Sadler, 1956.
General Organization of The Urantia Book -- Bill Sadler, Marian Rowley, 1965.