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Pontin, J.A. [ et al. ]. (). Interactive chemistry teaching units developed with the help of the local chemical industry (No. 3. Vol. 70 March-1993). : Journal of chemical education.

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Pontin, J.A. [ et al. ]. Interactive chemistry teaching units developed with the help of the local chemical industry. No. 3. Vol. 70 March-1993 : Journal of chemical education, . Index Artikel.

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Pontin, J.A. [ et al. ]. Interactive chemistry teaching units developed with the help of the local chemical industry. No. 3. Vol. 70 March-1993 : Journal of chemical education, . Index Artikel.

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Pontin, J.A. [ et al. ]. Interactive chemistry teaching units developed with the help of the local chemical industry. No. 3. Vol. 70 March-1993 : Journal of chemical education, . Index Artikel.