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Usually a unique accession or catalog number used to track an object through time, from its acquisition to its digitization.

Likely indicates this is the 98th image in a series, perhaps part of a large photographic collection or a multi-page document. mon0133925764_98.jpg

Frequently refers to a specific collection or sub-archive, such as "Monuments," "Manuscripts," or a specific donor's name. Usually a unique accession or catalog number used