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- 65049368 contributor B1649614.
- 65049368 contributor B1649615.
- 65049368 created "1961.".
- 65049368 date "1961".
- 65049368 date "1961.".
- 65049368 dateCopyrighted "1961.".
- 65049368 description "Bibliography: p. 167-168.".
- 65049368 extent "169 p.".
- 65049368 issued "1961".
- 65049368 issued "1961.".
- 65049368 language "bul".
- 65049368 publisher "Varna, Dʹrzh. izd-vo,".
- 65049368 spatial "Bulgaria.".
- 65049368 subject "HD57 .M492".
- 65049368 subject "Labor productivity Bulgaria.".
- 65049368 subject "Labor productivity.".
- 65049368 title "Rezervi za uvelichavane proizvoditelnostta na truda v promishlenostta ; obkhvashtane i izmervane.".
- 65049368 type "text".