"Sri Purushottam Singh Yog, graduated in Civil Engineering from Thompson College of Engineering, Roorkee in 1939, and retired from the post of Chief Engineer in the Irrigation Department, Uttar Pradesh, in 1974. After his retirement, he actively wrote about various contemporary social problems. His writings were well-researched and professionally authenticated. He got some of his writings published during his lifetime. He passed away in March 2011 at the age of ninety-four, he kept adding to his writings till his last breath. His personal stenographer, Sri R.K. Singh, transcribed and saved his writings in an obsolete desktop publishing program ‘PageMaker’ in about seventy files. Unfortunately, Sri R.K.Singh met with a fatal accident in 2010 and these files could not be opened for more than ten years. Finally in 2022, Sri Hitesh Singh Bisen who runs Booksclinic Publishing, could successfully open and convert these files into to Word/PDF formats. This opened a great treasure of Sri Purushottam Singh Yog’s writings which bring out the root causes for the present-day world crisis due to widespread terrorism. His writings also point out the grave danger of converting India from ‘Darul-Herb’ to ‘Darul-Islam’ leading to the extinction of secular ‘Sanatan Hindus’ destroying not only the world’s oldest and glorious ‘Vedic’ culture’ but also threatening various other minorities having multiple religious faiths and cultures. He also authored a few essays and a collection of stories highlighting some social evils ailing our society. These writings being published in fifteen volumes, are of immense value in the context of our national integrity and for safeguarding the ‘Hindu’ culture and our ancient civilization which seems on the verge of extinction. They bring out many lesser-known facts, a knowledge of which may help the readers to revise their opinions for the benefit of Hindutva and our secular nation Bharat/India. Ashok Kumar Yog"