found: Het Geografisch plechtanker, 1987:t.p. (Rob Tamsma)
found: nuc90-1919: His Three decades of regional policy in the Netherlands ... 1980(hdg. on MCM rept.: Tamsma, R.; usage: R. Tamsma)
found: Tamasa, R. The Netherlands in fifty maps : an annotated atlas, 1988:title page (R. Tamsma; Emeritus Professor of Economic and Social Geography, University of Groningen)
found: Wikipedia Netherlands, viewed 12 October 2020(Robert (Rob) Tamsma; born 16 January 1922 in Amsterdam; died 13 October 2005 in Loosdrecht; Dutch university teacher and geographer; received PhD cum laude; served as professor at University of Groningen from 1966 to 1988; research focused on the geography of the Northern Netherlands and energy geography) - https://nl.wikipedia.org/wiki/Rob_Tamsma
