What is the difference when using に and  には?

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Aug 21, 2010 08:19 particles 日本語
In my previous entry, I wrote many sentences using this form: ____に___がある/いる。

Many corrections included には. Although, some particles were not changed from に.

For example,

・図書館に本があります。

・私のかばんにはお金がありません。

How do I know when to use には?