Portrait of Albert Francis Birch (1903-1992), geophysicist
Unknown author<span style="display: none;">Unknown author</span>
<a rel="nofollow" class="external free" href="http://www.nap.edu/readingroom/books/biomems/fbirch.html">http://www.nap.edu/readingroom/books/biomems/fbirch.html</a>  National Academy of Science