Harry E. Mongold retired from civil service, pursuing interests in science and literature. In addition to several articles critical of Einstein's theory of special relativity, Mongold wrote two unpublished sequels to L. Frank Baum's Oz book series, and was active with the Wizard of Oz Club.
- "Does Relativity Theory Imply a Diety?" The American Rationalist, pp. ? (Sep-Oct 1980).
- "Quantum Fantasies," The American Rationalist, pp. 71-73 (Jan-Feb 1988).
- "An Exasperated Protest," Chronology & Catastrophism Workshop, N1, p. 38 (1991). [on relativity]
- Button Bright (1979)
- Sawhorse of Oz (1981)
- Jan Larsen, "Manhattan Write Pens Further Oz Adventures," Herald-News, Joliet, Illinois (Thursday, June 23, 1983) sec. 2, p. 5.