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1
by Piaget, Jean, 1896-1980.
Published 1949

Book
2
by Piaget, Jean, 1896-1980.
Published 1960

Book
3
by Piaget, Jean, 1896-1980.
Published 1974

Book
4
by Piaget, Jean, 1896-1980.
Published 1968

Book
5
by Inhelder, Bärbel.
Published 1969

Book
6
by Inhelder, Bärbel.
Published 1964

Book
7
by Piaget, Jean, 1896-1980
Published 1965

Book
8
by Piaget, Jean, 1896-1980.
Published 1995

Book
9
by Piaget, Jean, 1896-1980
Published 1966

Book
10
by Piaget, Jean, 1896-1980.
Published 1976

Book
12
by Piaget, Jean, 1896-1980.
Published 1952

Book
13
by Piaget, Jean, 1896-1980.
Published 1981

Book
14
by Piaget, Jean, 1896-1980.
Published 1972

Book
15
by Piaget, Jean, 1896-1980
Published 1997

Book
16
by Piaget, Jean, 1896-1980.
Published 1972

Book
17
by Beth, Evert Willem.
Published 1957

Book
18
by Piaget, Jean, 1896-1980.
Published 1962

Book
19
by Piaget, Jean, 1896-1980.
Published 1969

Book
20
by Piaget, Jean, 1896-1980.
Published 1949

Book