Note 6 — Chapter IX
Reading edition
Muldoon here ignores the two much earlier experimental rockets which left Earth in 1942 ... that of Dr. Frazier Wrenn from Arizona and that of Doktor Erich von Adlund from Berlin. (See Amazing Stories, Dec. 1939.) Since both these rocket flights came to disastrous end, the history of rocket travel really begins with the launching of the Wentworth-Kroll ship, Primus, in September, 1973.—Ed.