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The Sierra subspecies should be pretty clear (historically in the Sierra Nevadas, and released near Mt. Lassen).
I'm not sure about specific studies, but you could start here:
https://www.fws.gov/oregonfwo/ExternalAffairs/News/2015/Coastal_Marten_Final_Species_Report_April_2015%20(1).pdf
(just be aware of their bias in favor of Humboldt marten subspecies)
There seems to be issues with the geographic overlap of the subspecies -- both Martes caurina ssp. caurina and Martes caurina ssp. sierrae are shown in the southern Sierra Nevadas.