Karl Heinrich Ulrichs
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●    https://www.nytimes.com/2020/07/01/obituaries/karl-heinrich-ulrichs-over...
●    https://legacyprojectchicago.org/person/karl-ulrichs
●    https://www.allgaylong.com/blog/karl-heinrich-ulrichs/
●    https://www.ebsco.com/research-starters/social-sciences-and-humanities/k...
●    https://hsp.org/blogs/fondly-pennsylvania/karl-heinrich-ulrichs
●    https://www.makingqueerhistory.com/articles/2018/3/13/karl-hinreich-ulrichs
●    https://outhistory.org/exhibits/show/katz-ulrichs/katz-ulrichs
●    https://link.springer.com/article/10.1007/s12119-024-10254-8
●    https://hsl.hypotheses.org/2090