Kumin's collection of selected works from her first six books is called Our Ground Time Here Will Be Brief, and it includes "Address to the Angels." Published in 1982, this book also contains previously unpublished poems and provides a good, overall look at the spectrum of Kumin's work in the first two decades of her writing career.
Most readers who like Kumin's poetry also enjoy Sexton's, despite the obvious differences. The Complete Poems: Anne Sexton (1981) is the most comprehensive collection of Sexton's poetry on the market. Fittingly, its foreword is written by Kumin.
One of the most recent interviews with Kumin appeared in.....