Pebble in the Sky

The principal later issue is a 1951 printing that retains the 1950 dates but lacks the stated "First Edition" line and carries a lower flap price; the absence of the "First Edition" statement is the key distinguishing point. Doubleday's gutter-code dating system did not begin until the late 1950s, so neither the true first nor any contemporaneous reissue of this 1950 title bears a gutter code.