📁 参考
Reference is a category for sites devoted to the study of and access to information itself - teaching it (Education), using it (Knowledge Management), storing it (Libraries, Museums) - or sites containing information on topics varied and comprehensive enough that they could not be classified under the other top level Open Directory categories (Dictionaries, Directories, Encyclopedias).
子分类
条目 (20+)
The Elements of Morality, including Polity (1845), Vol. 2
http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa&idno=AFY6849.0002.001&view=toc
The Elements of Morality, including Polity (1845)
http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa&idno=AFY6849.0001.001&view=toc
History of the Inductive Sciences from the Earliest to the Present Time (1858), Vol. 2
http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa&idno=AGG5854.0002.001&view=toc
The Plurality of Worlds (1853)
http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa&idno=AGG8425.0001.001&view=toc