Piaget, Jean 1896-1980 creator mixed material monographic fre 1 Signed postcard (1942 September 18) written by Piaget to R. Bassalier thanking him for the proofs of The Intellectual Development of Children (undated). Open to research. Psychologist and author. Collection material in French. Forms part of: Miscellaneous Manuscripts collection. Bassalier, R Correspondence Psychologists Authors mm 99006435 Open to research. DLC 991118 20260227111727.0 mm 99006435