How does the poet use allusion in the poem, Thirteen Ways of Looking at a Blackbird?

The state of Connecticut appears in the allusion to Haddam in canto seven and in the eleventh canto in which the unnamed man in a glass coach rides over Connecticut. The physical landscape of Connecticut is never explicitly described in the poem. However, the snowy vistas are not entirely out of place for a northeastern seaboard climate. Connecticut is not an especially mountainous state, which suggests it might not be the locale described in the first canto.