There is considerable literature on P.williamsoni wrt Alberta.
You will not likely find scientific studies for any species from >80yrs ago.
For this time period, the only records would be commercial, and riverine catches are not as well recorded as lacustrine hauls due to their more, 'opportunistic', and less commercially viable nature.
There is data that would qualify as baseline for this species at least as far back as the mid-70's.
Articles can be posted if you want, just ask.
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