किसने पटना की सूती वस्त्रों के उत्पादन का केन्द्र बताया था ? - Who told Patna the center of production of cotton textiles? - Kisne Patana Ki Sooti Vastron Ke Utpadan Ka Center Bataya Tha ? Bihar Gk in hindi, Bihar Modern History Quiz Manuchi question answers in hindi pdf peter Mundi questions in hindi, Know About Mainrik Bihar Gk online test Bihar Gk notes in hindi quiz book Marshal