References in celestial mechanics

I've found lots of books in the local library that explain how orbits of
planets work. However none I can find specifically explain how to calculate
the positions of planets at specific times. Searching the web I've found
Keplarian elements for the planets, and also references to Jean Meeus's
Astronomical Elements. I've also found some negative reviews of that book.

So what does everyone reckon the best references are in this field? There
doesn't seem to be a huge amount on the web. So I'm assuming it will all be
in hard to find books.... Thanks,

David