Short textbook of econometrics? I'm looking for a textbook about econometrics, but I'd like to find one with the following features :

Short (350 pag. max)
Introductory
Clear on the math and stats used
With exercises

Do you know a book like this? Thanks!
My purpose is to be able to read it in not too much time and understand the subject without covering all aspects but just the essential.
An Introduction to Econometric Theory by James Davidson might be worth a look. It satisfies all your condition at a slim 256 pages.