| LC control no. | nr 88008480 |
|---|---|
| Personal name heading | Ridder, Helmut |
| Found in | Obst, C.-H. Chancen direkter Demokratie in der Bundesrepublik Deutschland, c1986: t.p. (Helmut Ridder) LC in RLIN, 9-8-88 (hdg.: Ridder, Helmut) Auf einem dritten Weg, 1989: t.p. (Helmut Ridder (celebrated his 70th birthday on Jul. 18, 1989)) |
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