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- 90180667 alternative "5. Nat︠s︡ionalna konferent︠s︡ii︠a︡ po speleologii︠a︡.".
- 90180667 alternative "Peta Nat︠s︡ionalna konferent︠s︡ii︠a︡ po speleologii︠a︡.".
- 90180667 contributor B6239207.
- 90180667 contributor B6239208.
- 90180667 contributor B6239209.
- 90180667 created "1989.".
- 90180667 date "1989".
- 90180667 date "1989.".
- 90180667 dateCopyrighted "1989.".
- 90180667 description "Includes bibliographical references.".
- 90180667 extent "135 p. ;".
- 90180667 issued "1989".
- 90180667 issued "1989.".
- 90180667 language "bul".
- 90180667 publisher "Sofii︠a︡ : Medit︠s︡ina i fizkultura,".
- 90180667 subject "Caving Congresses.".
- 90180667 subject "GB601.A2 N38 1987".
- 90180667 subject "Speleology Congresses.".
- 90180667 title "V Nat︠s︡ionalna konferent︠s︡ii︠a︡ po speleologii︠a︡ : Sofii︠a︡ 28-30 viii, 1987 / pod redakt︠s︡ii︠a︡ta na Todor Stoĭchev.".
- 90180667 type "text".