Quaker Spirituality: Selected Writings (2005)
Someone at Harper Collins apparently liked the Paulist Press series "The Classics of Western Spirituality", but decided they were too long for today's readers. As a result, they've published several shortened editions, including Emilie Griffin's shorter version of Quaker Spirituality: Selected Writings. It's much smaller than the original version, but still includes key writings by George Fox, John Woolman, Caroline Stephen, Rufus M. Jones, and Thomas R. Kelly.
Isaac Penington and Fox's Epistles aren't included, and a foreword by Rick Moody reflecting on his interest in Quakers replaces Douglas Steere's extended introduction.