The Royal Development (Trinity Mine)
Records are organized
in accordance with the following series and subseries arrangement:
Series I: Reports, 1923-1946
Series II: Inventories,
1923-1941
Series III: Correspondence and Construction File,
1923-1940
Series IV: Manuals and Catalogs,
1923-1945
Series V: Maps, Plans, and Oversize Material,
1896-1930
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