Army Landwalker 1964 mural concept.
U.S. Army
<a rel="nofollow" class="external text" href="https://babel.hathitrust.org/cgi/pt?id=mdp.39015078437293;view=1up;seq=186">Army Joins With DoD, NASA in Arranging World’s Fair Exhibit</a>. // Army Research and Development, April 1964, v. 5, no. 4, p. 36.