[{WikipediaArticle oldid='198969282'}]

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| Adolf Eduard Mayer (* 9. August 1843 in Oldenburg; † 25. Dezember 1942 in Heidelberg), als a.o. Professor in Heidelberg| HeidICON| Fotografie: J. & L . Allgeyer, Karlsruhe/Rastatt| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Adolf Mayer 1875.jpg
| Tomb of professor Leopold Gmelin at Heidelberg| Eigenes Werk| Ramessos| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:GrabLeopoldGmelin.jpg
| Photo of a tobacco leaf with symptoms of tobacco mosaic virus. UGA1402027| USDA Forest Service, http://www.forestryimages.org/browse/detail.cfm?imgnum=1402027| R.J. Reynolds Tobacco Company Slide Set| [{Image src='https://www.austria-forum.org/cc/images/slim/publicdomain.png' alt='Public domain' align='center' link='https://www.austria-forum.org/cc/public-domain-10.html' target='_blank'}]| Datei:Tobacco mosaic virus symptoms tobacco.jpg
| Wikisource logo, no text variant| By Rei-artur pt en Rei-artur blog| Nicholas Moreau| [{Image src='https://www.austria-forum.org/cc/images/slim/by-sa.png' alt='CC BY-SA 3.0' align='center' link='https://www.austria-forum.org/cc/by-sa-30.html' target='_blank'}]| Datei:Wikisource-logo.svg
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