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- SpringerLink (Online service)24,583
- ebrary, Inc7,223
- Safari Books Online (Firm)5,470
- SPIE Digital Library2,736
- Society of Photo-optical Instrumentation Engineers2,403
- Society of Photo-Optical Instrumentation Engineers2,053
- United States. National Aeronautics and Space Administration1,979
- Langley Research Center1,737
- United States1,363
- Lewis Research Center1,241
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- Peter E. Palmquist Photography Collection (Beinecke Rare Book and Manuscript Library)813
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- John Winston Graham Aeronautical Collection (Beinecke Rare Book and Manuscript Library)681
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