https://www.americanheritage.com/ en https://www.americanheritage.com/walter-camp-and-his-gridiron-game <span property="schema:name" class="field field--name-title field--type-string field--label-hidden">Walter Camp And His Gridiron Game</span> <span rel="schema:author" class="field field--name-uid field--type-entity-reference field--label-hidden"> <a title="View user profile." href="/users/john-stuart-martin" lang="" about="/users/john-stuart-martin">John Stuart Martin</a></span> <span property="schema:dateCreated" content="2011-01-20T14:54:56+00:00" class="field field--name-created field--type-created field--label-hidden">Thu, 01/20/2011 - 09:54</span> Thu, 20 Jan 2011 14:54:56 +0000 John Stuart Martin 51478 at https://www.americanheritage.com