<h1>Arp, Halton C.</h1>
<h2>Combined from <a href="https://authors.library.caltech.edu">CaltechAUTHORS</a></h2>
<ul>
<li>Arp, Halton C. (1964) <a href="https://resolver.caltech.edu/CaltechAUTHORS:20151211-113308787">Galaxy M 31</a>; Science; Vol. 145; No. 3635; 952; <a href="https://doi.org/10.1126/science.145.3635.952">10.1126/science.145.3635.952</a></li>
</ul>