These books include short introductory material (without much detail) on various topics which can help student to get an idea of different fields of mathematics, written especially for high school students preparing for Olympiad.
All these can be downloaded legally from http://mirtitles.org/2012/09/06/little-mathematics-library-taking-stock/
I have tabulated available books as per topic discussed in them:
[Last Edited: 11 July 2014]
Gaurish4Math 
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