P.N. Chopra was the Editor of the Indian Gazetteers, Chief Editor of WhoâÂÂs Who of Indian Martyrs in the Ministry of Education and Chief Editor of the âÂÂTowards Freedom ProjectâÂÂ. He has to his credit over forty authoritative works dealing with Indian history and culture, particularly the history of IndiaâÂÂs freedom struggle. He has also edited the fifteen-volume series, The Collected Works of Sardar Vallabhbhai Patel.