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New Technology of Library and Information Service  2004, Vol. 20 Issue (6): 79-82    DOI: 10.11925/infotech.1003-3513.2004.06.21
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The Study of Method of Comparing on PPC Service
Chen Baochun1   Zhou Jimin2   Han Shuhua2
1(Shijiazhuang Library, Shijiazhuang 050011, China)
2(Hebei Normal University Library, Shijiazhuang 050016, China)