Comic Title: Detective Comics #421
Publisher: DC (National Periodical Publications, Inc.)
Address: 909 Third Avenue, New York, NY
Cover Date: March 1972
On Sale Date: January 27, 1972 Newsstand Date January 27, 1972
Source: House Ad, Detective Comics #420, Page 46

Newsstand Date January 27, 1972
Source: Comic Reader, #79

Copyright Date January 27, 1972
Source: Library of Congress, Periodicals 1972

Frequency: Monthly
Cover Price: $0.25
Page Count: 48
Circulation: 199112
Editor: Julius Schwartz

Title: "Up Against Three Walls"
Pages: 9

Feature(s):
Batgirl (of Earth-1)

Writer: Frank Robbins
Artist: Don Heck

Reprinted In:
Showcase Presents:Batgirl Vol. 1 TPB (2007)
Batgirl:The Bronze Age Omnibus Vol. 1 HC (2018)

Feature Character(s)

• Batgirl (last appearance in Detective Comics #420; next appearance in Detective Comics #422)

Supporting Character(s)

• Commissioner Gordon (last appearance in Detective Comics #420; next appearance in Batman #240)