1.2  互联网分类目录-—精确打击的利器

Internet Subject Directories- Precision Strike Weapon

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1.2.1 通用分类目录

      General Subject Directories

( 1） 开放目录专案

开放目录 全靠义工 号称第一 刷新不停

DMOZ: Open Directory Project   

1.2.2 专业分类目录查找门户及学术数据库自备搜索引擎

Scholarly Subject Directory Finder and Database- Specific Search Engines

( 1） 院校资讯  

Academic Info： Educational Subject Directory – Online Degree Programs – Test Preparation Resources           

( 2）NCBI