Sivapuranam is dedicated to Lord Shiva written by Manikavasagar (Nayanmars), "The Siva Purana", suggests that the Vayu Purana is either a part of the complete Shiva Purana of twelve Samhitas. This is part of the Thiruvasagam.
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May Lord Shiva bring prosperity to you and your family.
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OM NAMA SHIVAYA.