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| Description: | Drawing of a time saving chart for one day's labor in a sawyard shop. |
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| Description: | Illustration showing the relationship of film speed, shutter speed, and aperture in photography. |
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| Description: | Sid's illustration showing the range of infrared and ultraviolet radiation and the color sensitivity of Panchromatic and Ortho films compared to human visi... |
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| Description: | Sid's illustration showing the relationship between film, a camera lens and the light controls for aperture and shutter speed in photography. |
| Date: | 08 2003 |
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| Description: | Site plan of the wreckage of the schooner Lumberman at the bottom of Lake Michigan. |
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