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Most college libraries and public libraries have multiple copies of Puntambekar's Formal Languages and Automata Theory . Scan the chapters you need (for personal study, which falls under fair use in many jurisdictions). Alternatively, use :

To help you determine if this is the right book for you, here is a detailed outline of the contents:

If you are looking for free study material on this specific subject, many academic institutions provide digital notes that cover the same syllabus: Malla Reddy College of Engineering (MRCET): Offers detailed Digital Notes on FLAT

" by A.A. Puntambekar is common, as this book is a staple for Computer Science students studying the foundations of computation. While many sites claim to offer "free downloads," most are third-party hosting platforms with varying levels of security and legality. Blog Post: Master Computation with Puntambekar’s FLAT