found: Work cat.: 98-174155: Der Regen, c1996:t.p. (Regen) p. 7, etc. (Regen is main river of Bavarian Forest; flows 200 km. beginning in border region of Czech Rep. to Regensburg from whence it flows into Danube)
found: Grosse Brockhaus, 1933:v. 15, p. 485 (Regen; tributary of Danube; originates in Bohemian Forest as Schwarzer Regen then Weisser Regen then Regen; at Regensburg flows into Danube)
found: Lippincott, 1962:p. 1566 (Regen River; formed by Black Regen River and White Regen River; flows into Danube at Stadtamhof [suburb of Regensburg])
