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2
Published 1986

Book
3
by Piaget, Jean, 1896-1980
Published 1980

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5

Book
6
by Nelson, Katherine
Published 1996

Book
7
Published 1996

Book
8
by Cowan, Philip A.
Published 1978

Book
9
by Bringuier, Jean Claude
Published 1980

Book
10
by Rosen, Hugh
Published 1977

Book