The Door Through Space

This is the English expansion of the novelette "Bird of Prey" to novel length. It was first published in German translation in 1959. According to Hans Joachim Alpers's "Marion Zimmer Bradley" in Joachim Körber (Hg.): "Bibliographisches Lexikon der utopisch-phantastischen Literatur, 29. Ergänzungslieferung" (1992), the text of the novel was abridged when it was published by Ace Double in "The Door Through Space / Rendezvous on a Lost World" in 1961. The original English manuscript of the novel was later lost. The author re-translated parts of the 1959 German text back into English when restoring the novel for its first full English publication in 1979. Note that some editions and some secondary sources claim that this work is a part of the {{S|Darkover}} series. According to {{SFE}}, it's only marginally related.'

• "This Ace Printing: August 1979"
• Has a full number line 2 4 6 8 0 9 7 5 3 1
• First single printing, previously published as 1/2 an Ace Double in 1961 and 1972
• Cover artist credited on copyright page, the artwork is also signed.