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Study on national structure for documentation and library services in countries with different levels of development : with particular reference to the needs of developing countries / [ed. by E.J. von Ledebur and S.F. Balázs].
- UNESCO,
- 1973.
- Paris :
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Small technical libraries : a guide for librarians without technological training / by D.J. Campbell.
- UNESCO,
- 1973.
- Paris :