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1752794
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Format: Index Card
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Western History Subject Index
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Denver Public Library
Digital Collections
Vendor-specs-microfile
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Vendor-specs-microfile New microfilm filing device invented by Richard H. O'Brien. Post Sept. 6, 1959 p.13A Clips
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Western History Subject Index
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Western History Subject Index Abbreviations
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Index Card
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eng
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Vendor-specs-microfile
, [622543]. Denver Public Library Digital Collections, accessed 12/02/2026, https://digital.denverlibrary.org/nodes/view/1752794
