| LC control no. | n 90610929 |
|---|---|
| Personal name heading | Graf, Dittmar, 1955- |
| Found in | His Begriffslernen im Biologieunterricht der Sekundarstufe I, 1989: t.p. (Dittmar Graf) p. 4 of cover (b. 1955 in Melbach) |
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