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by Rost, Thomas L.; Barbour, Michael G.; Stocking, C. Ralph; et al.
by Edited by Michael G. Barbour , William Dwight Billings
by Barbour, Michael G.; Barbour, Michael G.; California Native Plant Society
by Barbour, Michael G.; Burk, Jack H.; Pitts, Wanna D.
by Barbour, Michael G.; Burk, Jack H.; Pitts, Wanna D.; et al.
by Barbour, Michael G.; Evarts, John; Popper, Marjorie