Atlas of skipjack tuna fishing grounds in southern waters, 1966 season
Tohoku Regional Fisheries Research Laboratory. 1968. Atlas of skipjack tuna fishing grounds in southern waters, 1966 season. U.S. Fish and Wildlife Service. Honolulu, Hawaii
The number of skipjack tuna caught (tons per day) from July 1966-April 1967. The location and number of fish caught are marked on charts of the Marianas region.