I can't find my book by Frank DuFresne but I can give you an idea of what he saw. Frank was one of the first US Biological Survey People in Alaska. That department now is USFWS.
Frank was at Rika's Roadhouse in Big Delta [8 miles north of Delta Jct] where the big pipeline bridge crosses the Tanana.
In those days, [probably late 20s] the Forty Mile Herd often migrated through that area and up the Delta River to Isabel Pass country. Frank Glaser [Alaska's Wolf Man] spoke of same massive migrations.
DuFresne watched and tried to count the mass of caribou as they headed up the Delta River. He rough counted 300K in one day and thought that probably a million caribou passed through while he was there.
