Algebra of Night: New & Selected Poems, 1948-1998. Poems by Willis Barnstone. Published by Sheep Meadow Press in 1999.
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See this review from the publisher.

"Algebra of night! I just love this book. It is a dazzling cross section of his passionate wisdom and wit. With Borgesian scope and cunning, in free verse or invisible sonnets, Barnstone floats us to resonant surprise. Out of an extraordinary life and richness of many languages, literatures and travels ranging over the world, this gorgeous energy of a poet of genius. I don't believe he sleeps!"
--Ruth Stone