पटना पुस्तक मेला का आयोजन कब से किया जाता है ? - When is the Patna Book Fair organized? - Patana Pustak Mela Ka Aayojan Kab Se Kiya Jata Hai ? Bihar Gk in hindi, Religious and Tourist Place 1975 Ee. question answers in hindi pdf 1972 Ee. questions in hindi, Know About 1970 Ee. Bihar Gk online test Bihar Gk notes in hindi quiz book 1971 Ee.