Count Ferdinand von Zeppelin by <a href="//commons.wikimedia.org/wiki/Category:Photographs_by_E._Bieber" title="Category:Photographs by E. Bieber">E. Bieber</a>, 1912/13
<bdi>E. Bieber
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<a rel="nofollow" class="external text" href="https://archive.org/stream/menaroundkaiserm00wilerich/menaroundkaiserm00wilerich#page/n86/mode/1up">Frederic William Wile: Men around the Kaiser (1913)</a>