CC BY 4.0
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<ul><li>Gallery: <a rel="nofollow" class="external free" href="https://wellcomeimages.org/indexplus/image/M0017597.html">https://wellcomeimages.org/indexplus/image/M0017597.html</a></li>
<li>Wellcome Collection gallery (2018-03-29): <a rel="nofollow" class="external free" href="https://wellcomecollection.org/works/mdfpppw5">https://wellcomecollection.org/works/mdfpppw5</a> <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by/4.0/">CC-BY-4.0</a></li></ul>