<Tr> <Td> Literature portal </Td> </Tr> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Sangam literature deals with emotional and material topics such as love, war, governance, trade and bereavement . Some of the greatest Tamil scholars, like Thiruvalluvar, who wrote on ethics, and on the various issues of life like virtue, wealth and love, or the Tamil poet Mamulanar, who explored historical incidents that happened in India, lived during the Sangam period . </P>

Write one way in which the literary sources of the sangam age are not useful for us