L: The Adventures of Superman #424 (January 1987), art by Jerry Ordway
M: The Adventures of Superman #499 (February 1993), art by Tom Grummett, Doug Hazelwood, and Glenn Whitmore
R: Action Comics #727 (November 1996), art by Tom Grummett, Denis Rodier, Patrick Martin
(Thanks to Anonymous in the comments for pointing out what I shoulda realized: the three covers below are homages to Superman #14!
(Click picture to edifi-size)