UPSC IAS Civil Engineering Books References 

Strength of material - Gere and Timoshenko
Concrete Technology - M.S. Shetty
R.C.C. (WSM) - Shyal and Goyal
R.C.C. (LSM) - A.K. Jain
Steel Structure - L.S. Negi
Soil Mechanics - K.R. Arora
Fluid Mechanics - Modi & Seth
Theory of Structure (Vol - II) - Vazirani and Ratwani
Irrigation Engineering - S.K. Garg
Prestress Concrete - N. Krishna Rajee
Engineering Hydrology - K. Subramanya

UPSC IAS CHEMISTRY Books References 

PHYSICAL CHEMISTRY

Gaseous state, Thermodynamics, Phase rule, solutions, Colligative properties, Electro Chemistry, Catalysis,
Colloids - Principals of physical chemistry - Puri, Sharma & Pathawa
Chemical kinetics - Advance physical chemistry - Gurdeep Raj
Photo chemistry - A text book of physical chemistry (Vol. - IV) - K.L. Kapoor
Advance physical chemistry - Gurdeep Raj.

ORGANIC CHEMISTRY

Bonding and shape of organic molecules, Stereo chemistry of carbon compound - Reactions and reagents - O.P. Agarwal
A guide to mechanism in organic chemistry - Peter Sykes
Rest all the chapters - A text book of organic chemistry - Bahl & Bahl

INORGANIC CHEMISTRY

Atomic Structure - Principle of physical chemistry - Puri, Sharma & Pathwa
Advance inorganic chemistry - J.D. Lee
Chemical Periodicity, Chemical bonding,Coordination compound - Selected topics in inorganic chemistry - Maden, Malik, Tuli
Theoretical principles of inorganic chemistry - G.S. Manku,
Extradiction of metals, Principle of inorganic chemistry - Puri, Sharma, Jauhar.
Rest all the chapters - An advance inorganic chemistry - J.D. Lee
Pollution and its control - A text book of environmental chemistry and pollution - S.S. Dara.