COIMBATORE: Officials of the Directorate of Vigilance and Anti-Corruption (DVAC) launched an investigation at Periyar Arivulagam library in Gandhipuram in Coimb. A five-member team of DVAC officials examined documents related to the purchase of books. Sources said the officials scrutinised accession registers, purchase invoices, price lists, payment records and details of cheques issued to publishers.