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		No cover image available Les fondements psychologiques des programmes scolaires / Williard C. Olson. by Olson, Willard C. Series: études et documents d´éducation ; 26.Material type: Text; Literary form: Not fiction Publication details: Paris : UNESCO, 1958Availability: Items available for reference: Disponible (Préstamo en sala) (1) . Collection(s): UNESCO Call number: 373.3 =40 OLS No. 26.
		No cover image available Psychological foundations of the curriculum / Williard C. Olson. by Olson, Willard C. Series: Educational studies and documents ; 26.Material type: Text; Literary form: Not fiction Publication details: Paris : UNESCO, 1957Availability: Items available for reference: Disponible (Préstamo en sala) (1) . Collection(s): UNESCO Call number: 373.3 =20 OLS No.26.

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