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- Libraries, information centers, and databases in biomedical sciences : a world guide / edit. Bettina Bartz, Helmut Opitz, Elizabeth Richter - München : Saur , 1991 - xxiv, 392 s. ISBN 3-598-11101-4 [1, currently available 1]
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book
- Publishers' international directory with ISBN index. 1, Afghanistan-Uruguay / edit. Helmut Opitz, Karl Heinz Strasser . - 15th ed. - München : Saur , 1988 - xix, 904 s. (Handbook of international documentation and information; vol. 7) ISBN 3-597-20537-6 [1, currently available 1]
- Chapters, articles
book
- Publishers' international directory with ISBN index. 2, U. S. A. - Zimbabwe / edit. Helmut Opitz, Karl Heinz Strasser . - 15th ed. - München : Saur , 1988 - s. 5, 907-1770 (Handbook of international documentation and information; vol. 7) ISBN 3-598-20537-6 [1, currently available 1]
- Chapters, articles
book