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_aHeikkinen, Vaino _926535 |
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_aA study in the learning process in the school class environment : _bremarks on the influence of certain motivation factors |
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_aHelsinski, _c1957. |
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_a54 p. ; _c22 cm. |
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_aAnnales Academiae Scientiarum Fennicae. Ser. B. ; _v111, 3 |
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