is to use the card catalogu
The catalogue is an index of all the book
All the cards are filed alphabeticall
and storied in drawers in large cabinet
There are three types of cards found in the card catalogu
an author card ,a title car
and a subject card.
The card catalogue can help you to find a book easil内容来自 听力课堂网：http://www.tingclass.net/show-9179-287766-1.html