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![Studying net contrast by using a gray scale board fish9630.jpg Studying net contrast by using a gray scale board](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_fish9630.jpg?itok=DP7UUPCX)
Description
Studying net contrast by using a gray scale board. (Image credit: NOAA Central Library Historical Fisheries Collection)
Credit
NOAA Central Library Historical Fisheries Collection
Location
California, San Diego
Collection
Historic Fisheries