Ellen Hammer
...that Ellen Hammer is regarded as one of the first Americans to study the history of Vietnam?
...that <b id="mwtg"><a href="./Ellen_Hammer" id="mwtw" rel="mw:WikiLink" title="Ellen Hammer">Ellen Hammer</a></b> is regarded as one of the first Americans to study the <a href="./History_of_Vietnam" id="mwuA" rel="mw:WikiLink" title="History of Vietnam">history of Vietnam</a>?