Copyright page adds "1979" to copyright statement for both works, no other date
Both Clute editions have the date as 1980
No indication of printing
ISBN on copyright page 0-8037-1343-6
Title on cover and title page is "The Black Corridor" over "The Adventures of Una Persson and Catherine Cornelius"
Copyright has full title "The Adventures of Una Persson and Catherine Cornelius in the Twentieth Century"
Title page has "THE DIAL PRESS" over "DAVIS PUBLICATIONS, INC."
Cover artist uncredited
Price obscured or not present on reference copy
source for the price is Locus #232 (April 1980)
OCLC and amazon list this and another Dial Press title with the same ISBN
