Comic Title: X-Factor #21
Publisher: Marvel
Cover Date: October 1987
On Sale Date: July 14, 1987 Newsstand Date July 14, 1987
Source: Marvel Age, #54

Newsstand Date July 16, 1987
Source: Amazing Heroes, #121

Shipping Date June 23, 1987
Source: Marvel Age, #54

Shipping Date June 23, 1987
Source: Amazing Heroes, #121

Shipping Date June 23, 1987
Source: Capital City Distributors, Orderpack June 1987

Copyright Date June 11, 1987
Source: Library of Congress, Copyright Office 1987
Marvel LoC dates from May 1987 to Nov 1987 are erroneous
All issues within a given month use the same date

Cover Price: $0.75
Page Count: 32
Editor: Bob Harras

Title: "For Every Action..."
Pages: 22

Feature(s):
X-Factor

Writer: Louise Simonson (Jones)
Penciller: Walter Simonson
Inker: Bob Wiacek
Letterer: Joseph Rosen
Colorist: Petra Scotese (Goldberg)

Reprinted In:
Essential X-Factor Vol. 2 TPB (2007)
X-Factor Epic Collection:Angel of Death TPB (2021)
X-Men:The Fall of the Mutants Omnibus HC (2022)
X-Men:The Fall of the Mutants Omnibus HC [Variant] (2022)