(1973). Study on national structures for documentation and library services in countries with different levels of development with particular reference to the needs of developing countrias. Paris: 1973.

Study On National Structures for Documentation and Library Services in Countries With Different Levels of Development With Particular Reference to the Needs of Developing Countrias. Paris: 1973, 1973.

Study On National Structures for Documentation and Library Services in Countries With Different Levels of Development With Particular Reference to the Needs of Developing Countrias. Paris: 1973, 1973.