found: Jäppinen, J. Pirkanmaa, c1983.
found: GeoNet, Nov. 16, 2005(Pirkanmaa; ADM2; 61°42ʹN, 23°43ʹE; variant: Birkaland)
found: GEOnet, viewed 16 Aug. 2022(Pirkanmaa [approved]; Pirkanmaan Maakunta [approved]; Birkaland [approved]; Landskapet Birkaland [approved]; ADM1 in Finland; lat: 61:42:00, long: 23:43:00; variants: Tampere; Tampere Region)
found: Wikipedia.com, viewed 16 Aug. 2022(Pirkanmaa; Pirkanmaan maakunta; Region of Prikanmaa; Swedish: Birkaland, Landskapet Birkaland; Latin: Birkaria; also known as Tampere Region in government documents) - https://en.wikipedia.org/wiki/Pirkanmaa