pl23_fish9631.jpg
![Studying net contrast by using a gray scale board fish9631.jpg Studying net contrast by using a gray scale board](https://s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fish9631.jpg)
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https://www.noaa.gov/media/digital-library-photo/pl23fish9631jpgDescription
Studying net contrast by using a gray scale board.
Credit
NOAA Central Library Historical Fisheries Collection
Location
California, San Diego
Collection
Historic Fisheries