There are books and books.并非“有许多许多的书”之意，用and连接的两个名词的重复现有时是为了区分不同的类型，尤其是区分好与坏。因此，该句意为：书有各种，有的不一读，有的开卷有益。

词典中and的用法已说明了这一点：

and used to connect two identical words to indicate that things of the same name or class have different qualities. [用来连接两个相同的词表示同一事物有不同性质]此外还有contrasting with (different kinds of the same thing) 与（同一事物的不同种类）相对照:

Don't worry there are rules and rules, ie Some rules are more important, more easy to ignore, etc than others. 别担心--规则跟规则不一样（有的规则比其他规则重要、 容易疏忽等）.

All human conduct is determined or caused—but there are causes and causes.所有人类行为都是先决的或有原因的——但有这样那样的原因。

There is coffee and coffee.咖啡有这种那种之分。