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A recent book was just published by the University of Georgia Press:
Weeds of the South. 2009. Edited by Charles T. Bryson and Michael S. DeFelice.
ISBN 978-0-8203-3046-4, paperback, 480 pp, 1577 color photos, 405 maps. Click here to see a Table of contents and sample pages.
More details and ordering details can be found at: http://www.ugapress.org/0820330469.html