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Original Format
- Black-and-white print (photograph)48,869
- Microforms12,505
- Digital photographs9,464
- Color slides7,861
- Record documents6,334
- Tracings6,253
- Drawings3,512
- Measured drawings2,704
- Archival collection2,057
- Linens1,625
- Color photographs1,486
- Serials (publications)1,457
- Typescript (unpublished)1,289
- QSL card1,126
- Black-and-white (negatives)770
- Lantern slide688
- Amateur radio station QSL cards666
- Pamphlets478
- Digital images391
- Handwriting (unpublished)369