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I want to know books which is most useful for preparation of IFS(Forest) with optional subject agriculture engineering & chemistry? Reference book for ifs of agricultural engineering & chemistry

Useful books for preparation of IFS(Forest) optional subjects Agriculture engineering & Chemistry:-

> Plant breeding by BD Singh
> Genetics by BD Singh
> Physiology by Pandey and Singha
> Agronomy by Yellamanda Reddy
> Handbook of agriculture by ICAR

> Atomic structure principle of physical chemistry by Puri, Sharma and Pathwa
> Advanced inorganic chemistry by JD Lee
> Theoretical principles of inorganic chemistry by GS Manku
> Pollution and its control by SS Dara