 The travel guide to Gaya, Bihar was likely inserted before the 15th-century, because the "Gaya-mahatmya" was referenced many times by the 15th-century Vacaspatimisra (not to be confused with 9th-century Advaita scholar of the same name).The text also contains chapters on music, various "shakhas" of the Vedas, Pashupata-Yoga, and geographic "Mahatmya" (travel guides) particularly about Gaya in Bihar.The "Vayu Purana" also features other topics such as those dealing with construction of mountain top Hindu temples.