SEN'N75 UG/24431 UG/24432 UG/24433 UG/24434 Sen, Gopal Chandra Principles of machine tools / Gopal Chandra Sen and Amitabha Bhattacharyya. – enlarged 2nd ed. – Kolkata : New Central Book Agency , 1975 (2013 reprint) xx, 954p. ISBN8173811555 : Rs.465/- . Machine – tools | Machining . Bhattacharyya, Amitabha |