Great Lakes Research Vessel Operations 1958-2018: Trawl. (ver. 3.0, April 2019)

All trawl data represented here expand upon vessel operations (OP table) data, all of which are collected by the United States Geological Survey, Great Lakes Science...此处呈现的全部拖网数据均依托船舶作业（OP表）数据进行拓展完善，所有此类数据均由美国地质调查局（United States Geological Survey）五大湖科学相关机构采集