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The database can be cited via its URL: http://boehler.zikg.eu.

The individual records do not yet have permalinks or DOI's for citation.

Individual index cards can be cited analogously to these two examples:

ZI München/Photothek, Archiv Julius Böhler, Karteisystem München, M_36-0073
ZI München/Photothek, Archiv Julius Böhler, Karteisystem Kommission, K_220_29

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For legal reasons, only information that is subject to the valid regulations on personal rights can be put online. Therefore, some internal links are suppressed that would lead to more recent information.