Comic Title: Detective Comics #422
Publisher: DC (National Periodical Publications, Inc.)
Address: 909 Third Avenue, New York, NY
Cover Date: April 1972
On Sale Date: February 29, 1972 Newsstand Date February 29, 1972
Source: Direct Currents, Superman #250, Page 47

Newsstand Date February 29, 1972
Source: House Ad, Detective Comics #421, Page 47

Newsstand Date February 29, 1972
Source: Comic Reader, #81

Copyright Date February 29, 1972
Source: Library of Congress, Periodicals 1972

Frequency: Monthly
Cover Price: $0.25
Page Count: 48
Editor: Julius Schwartz

Title: "The Unseen Clue"
Pages: 4

Artist: Howard Purcell

Reprinted From:
Gangbusters #54 (1956)