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各国图书馆之间的出版物交换是各国之间文化合作的最广泛而有效的一种形式,因此,在1975年赫尔辛基大会的最后文件中曾几次提到必须发展出版
The exchange of publications among national libraries is one of the most widespread and effective forms of cultural cooperation among nations, and therefore, several references in the final document of the 1975 Helsinki Congress to the need to develop the publication