Until recently I generally dipped into my poetry books at random and read a few pages at a sitting. I might in this haphazard manner read a complete volume. There was no plan & this would generally only with my most beloved poets. A few years ago, I began to read complete volumes. It points your attention to themes running through a volume of poems. With "Collected" or "Selected" Works, reading the complete volumes allows one to follow the arc of the poet's interests & craft. To me, Muriel Rukeyser's voice grew clearer and stronger as her life progressed. Her last poems have an urgency that has built to a crescendo.