UPSC/PSC - Important book pdfs

Some important book pdfs for upsc/pcs
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1. Environment - Shankar IAS Academy
https://drive.google.com/file/d/0BxkQmyYIKVgATWpzVmJ4TUJWN2M/view?usp=sharing

2. Science and Technology - TMH Publication
https://drive.google.com/folderview?id=0B-7pRR2ueeZTS1hZNXlsUVlqNUU&usp=sharing

3. Indian Economy - Key Concepts - Shankarganesh
https://drive.google.com/file/d/0Bzf3Puazcx04OVJER3VWaVd1Qjg/view?usp=sharing

4. Indian Polity - Laxmikant
https://drive.google.com/file/d/0BxkQmyYIKVgAbE1tNDJhZjZBZTQ/view?usp=sharing

5. Indian Economy - Ramesh Singh
https://drive.google.com/file/d/0B-7pRR2ueeZTMzh4N2dtcTFic3c/view?usp=sharing

6. Geography - G C Leong
https://drive.google.com/file/d/0Bzf3Puazcx04a3dDeDhJSlU0R0U/view?usp=sharing

7. Lucent - General Knowledge
https://drive.google.com/file/d/0BxkQmyYIKVgAUWxzSUJLOTdGdEE/view?usp=sharing

8. IndiaN Foreign Policy - Rajiv Sikri
https://drive.google.com/file/d/0BxkQmyYIKVgAV3A0U09IMThZUzQ/view?usp=sharing

9. Spectrum - Art and Culture
https://drive.google.com/file/d/0B-7pRR2ueeZTSXpUamFwaUFKbms/view?usp=sharing

10. History - Spectrum
https://drive.google.com/file/d/0BxkQmyYIKVgATjRod2lFVjNzT3c/view?usp=sharing

11. India Since Independence - Bipan Chandra
https://drive.google.com/file/d/0BxkQmyYIKVgAb2JwNnRZWGozV00/view?usp=sharing

12. India's Struggle for Independence
https://drive.google.com/file/d/0BxkQmyYIKVgAVU52RDhZWlVzQ1U/view?usp=sharing,