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Books in Ace double novel books series

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  • The crossroads of time

    Andre Norton

    Paperback (Ace, March 15, 1956)
    No. D-546. First printing. First separate appearance (originally an Ace Double). Cover art by Robert Schulz.

  • The door through space

    Marion Zimmer Bradley

    Unknown Binding (Ace Books, Jan. 1, 1961)
    None