@phdthesis{ 0-1073452328, title = {Um das Fach 'Sachkunde' in einer Sonderschule fuer Lernbehinderte zentrierte Wirkungseinheiten seelischen Geschehens}, author = {Westphal, Erich}, address = {Dormagen}, publisher = {}, year = {1972}, school = {Köln, Univ., Diss., 1971}, language = {German}, url = {https://katalog.skd.museum/Record/0-1073452328} }