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Helmolt, H.F. (Contributor). Portrait of Proudhon, Pierre Jospeh (1809-1865) - University of Texas Libraries Collections. 1902. https://collections.lib.utexas.edu/catalog/utlmisc:8768318a-f67f-49d2-bba8-563b5272b07dAPA
Helmolt, H.F. (Contributor). (1902). Portrait of Proudhon, Pierre Jospeh (1809-1865). Retrieved July 31, 2025, from https://collections.lib.utexas.edu/catalog/utlmisc:8768318a-f67f-49d2-bba8-563b5272b07dChicago
Helmolt, H.F. (Contributor). Portrait of Proudhon, Pierre Jospeh (1809-1865). 1902. "Portrait of Proudhon, Pierre Jospeh (1809-1865) – Collections". University of Texas Libraries Collections. <https://collections.lib.utexas.edu/catalog/utlmisc:8768318a-f67f-49d2-bba8-563b5272b07d> (31-July-2025).Note that these citations have been automatically generated, please verify that citation is correct and contains all necessary information.