<div class="description">
<ul><li><b>Scope and content:</b>  Original caption: Astronaut Virgil I. Grissom, 35, is shown following centrifuge testing at Johnsville, Pennsylvania which took place during April of this year. Grissom is one of three astronauts who have Aeronautics and Space Administration's Project Mercury program.</li></ul></div>
<div class="fn value">
Unknown author<span style="display: none;">Unknown author</span> or not provided</div>
April 1961
<a href="https://en.wikipedia.org/wiki/U.S._National_Archives_and_Records_Administration" class="extiw" title="en:U.S. National Archives and Records Administration">U.S. National Archives and Records Administration</a>