The Netherlands Central society for rehabilitation and world Committee on Special Education of the International Society for Rehabilitation of the Disabled; Bakker, P. D.; Moulijn, C. D.; Van den Broek, P.
Nicolai, Johann Christoph; D. R.; Hellich, Christoph; Cramer, Georgius; Thomas, Jacob; Löscher, M. C.; Deuttrichen, Joann; Rudolph, Johann; Kühnhart, Tobias; Preuser, Paul; Köhler, Christian; G. L.; Seyffert, Christianus; Schmid, Georgius; J. L.; P. H.; J. V.; J. S.; Herrmann, Gottfried; Ungefug, J.; J. C. H.