On a recent morning, in the hazy heat, poet Mark DeCarteret opened up Water Street Books in Exeter, where he works, as what he calls "book clerk extraordinare." "Alice who works here has got quite the skill with the sign-making," he says, pointing to a sandwich board on which someone has drawn a bird. "So she came up with that for the book launch." The board advertises DeCarteret's newest collection of poetry, For Lack of a Calling. It's set to launch here on Thursday, September 6th. The sign is fitting, given the many birds that appear in these poems, including the poem that gave the book its name. DeCarteret has been working in bookstores on and off for many years. Since he began seriously writing poetry in his 20s, he's published in well-regarded literary magazines and assembled several collections. DeCarteret says he takes a "grab bag" approach to collecting poems for a book. "I stuff 'em in a gym bag and take the next flight," he says. In this case, the metaphorical plane tickets