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    "label": "Portrait of Hermann von Helmholtz (1821-1894)",
    "thumbnail": {
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    "metadata": [
        {
            "label": "Collection",
            "value": "Caltech Photographs"
        },
        {
            "label": "Series",
            "value": "Photographs Related to History of Science Beyond Caltech"
        },
        {
            "label": "Extents",
            "value": [
                "1 photographs (negative)"
            ]
        },
        {
            "label": "Abstract",
            "value": [
                "Photogravure of a photo portrait of German physician and physicist Hermann von Helmhotz in his later years; most famous for his work on acoustics and the conversion of energy. His signature reproduced below the portrait. Verlag von Wilhelm Engelmann in Leipzig. Photogravure Meisenbach Riffarth & Co. Berlin"
            ]
        }
    ],
    "attribution": "<p>These digitized collections are accessible for purposes of education and research. Due to the nature of archival collections, archivists at the Caltech Archives and Special Collections are not always able to identify copyright and rights of privacy, publicity, or trademark. We are eager to <a href=\"mailto:archives@caltech.edu\">hear from any rights holders</a>, so that we may obtain accurate information. Upon request, we\u2019ll remove material from public view while we address a rights issue.</p>",
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                    "width": "286",
                    "height": "424",
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