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- 83464231 contributor B4590223.
- 83464231 contributor B4590222.
- 83464231 created "1979.".
- 83464231 date "1979".
- 83464231 date "1979.".
- 83464231 dateCopyrighted "1979.".
- 83464231 description "Includes bibliographical references.".
- 83464231 extent "4, 240 p. ;".
- 83464231 issued "1979".
- 83464231 issued "1979.".
- 83464231 language "bul".
- 83464231 publisher "Sofii︠a︡ : T︠S︡entr. sŭvet na Bŭlgarskite profesionalni sui︠u︡zi,".
- 83464231 spatial "Bulgaria".
- 83464231 subject "HD7741.5 .N38 1979".
- 83464231 subject "Industrial welfare Bulgaria Congresses.".
- 83464231 type "text".