Signature of <a href="https://es.wikipedia.org/wiki/Carlos_Ibarguren" class="extiw" title="es:Carlos Ibarguren">Carlos Ibarguren</a> (1877 - 1956), an Argentine historian and politician.
<a rel="nofollow" class="external text" href="https://archive.org/stream/argentinesoftoda01parkuoft#page/n589/mode/2up"><i>Argentines of To-Day</i> (1920)</a>, William Belmont Parker