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Catalog Number 1997.62.2
Object Name microfilm aperture card systems
Scope & Content microfilm aperture card systems

REMARKS:Aperture cards prepared by Percy J.C. Brown, a Bureau of Land Management employee who researched original locations of segments of the Oregon Trail. This set of cards reprints various plat maps for Oregon Trail locations.
Creator Percy J.C. Brown
Title Aperture cards of various survey plat maps
Accession number 1997.62