File:The Progressive H-bomb cover.jpg

Background info
The cover of the November 1979 issue of The Progressive magazine, advertising their publication of "the secret of the hydrogen bomb". (See Teller–Ulam design) The cover features a sequence from Howard Morland's drawings of the stages of a detonating hydrogen bomb.

The cover was taken from a PDF of the issue distributed by The Progressive online at http://progressive.org/?q=node/2252. The image of the bomb itself is copyright Howard Morland (not The Progressive).

Because this cover is itself the primary illustration of a historic event (that is, the publication of a historic issue of a magazine), is being provided at a low resolution, and no free alternatives are likely available, and the copyright holder is clearly identified, I believe the use of this to illustrate the publication of this issue on the non-profit English Wikipedia falls within the "fair use" clause of U.S. copyright law. Any other usage may not be as such.