We're pretty sure most librarians have heard of this site, but it's seriously one of the best reference sites on the Web.

Library of Congress Online Catalogs：我们十分确定大多数图书管理员已经听过这个网站了，严格地说它是目前网络上最好的一个引用站点。

youdao

Library of Congress Online Catalogs: We're pretty sure most librarians have heard of this site, but it's seriously one of the best reference sites on the Web.

Library of Congress Online Catalogs：我们十分确定大多数图书管理员已经听过这个网站了，严格地说它是目前网络上最好的一个引用站点。

youdao