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1991年,在地学信息中有几个值得注意的倾向仍保持了一定的势头。其中最重要的是数字化格式的数据库数量急剧增加,特别是 CD(compact disk)-ROM。在 CD-ROM 目录数
In 1991, there were several noteworthy tendencies in geoscience information that maintained some momentum. One of the most important is the dramatic increase in the number of databases in digital format, especially CD (compact disk) -ROM. The number of CD-ROM directories