Depends on what you mean by worth keeping. If you are looking for a monetary gain, then no. If you are thinking of starting a worldwide stamp collection, then yes.
These are all very common low value stamps. If you found them in a library book, then I suggest you put them back. It is a common practice for some people to put unwanted or surplus stamps in a library book in order to get people interested in stamps.
I agree with PMStamp. 19 common stamps from 10 different countries. A very small start on a worldwide collection. If you don't want them, put them back so that they may find their intended recipient.
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