Loodusõpetuse tööraamat 7. klassile. II osa, Loodusvarad. Majandus. Looduskaitse ja keskkonnakaitse
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Available at the authorised workplace in the National Library of Estonia, Archival Library of the Estonian Literary Museum, Tallinn University of Technology Library, University of Tartu Library and Academic Library of Tallinn University
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URL: http://www.digar.ee/id/nlib-digar:641742
