<h1>Babcock, Harold D.</h1>
<h2>Article from <a href="https://authors.library.caltech.edu">CaltechAUTHORS</a></h2>
<ul>
<li>Dieke, G. H. and Babcock, Harold D. (1927) <a href="https://resolver.caltech.edu/CaltechAUTHORS:DIEpnas27">The Structure of the Atmospheric Absorption Bands of Oxygen</a>; Proceedings of the National Academy of Sciences of the United States of America; Vol. 13; No. 9; 670-678</li>
<li>Hale, George E. and Babcock, Harold D. (1915) <a href="https://resolver.caltech.edu/CaltechAUTHORS:HALpnas15c">An attempt to measure the free electricity in the sun's atmosphere</a>; Proceedings of the National Academy of Sciences of the United States of America; Vol. 1; No. 3; 123-127</li>
</ul>