Prelude to Space

The Harcourt, Brace & World reissue in 1970 has a "Post-Apollo Preface." The dedication is changed from the original "To Val / — Despite his proof that nuclear ramjets are totally impracticable" to "To Val and Wernher / Who are doing the things I merely write about." There are some deletions, e.g., speculation on a hypothetical article on "Scientific Romances and Their Effects on the Development of Astronautics" a.k.a. "Science Fiction—Its Cause, Diagnosis and Cure", p. 125). "make the Moon the fiftieth State" on p. 93 is changed to "fifty-first" (p. 117). There is an added explanation of why the characters did not consider what turned out to be the actual architecture of the first manned lunar rocket: their erroneous belief that "It would be quite impossible to build one huge spaceship that would make the journey to the moon and back on a single load of fuel" (p. 80).