01254oam 2200421Ia 450 991069744490332120080829184551.0(CKB)5470000002388494(OCoLC)49786084(EXLCZ)99547000000238849420020514d2001 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierBiological soil crusts[electronic resource] webs of life in the desert[Reston, Va.] :U.S. Dept. of the Interior, U.S. Geological Survey,[2001]2 unnumbered pages digital, PDF fileUSGS fact sheet ;FS-065-01Title from title screen (viewed on Aug. 28, 2008)."July 2001, reprinted May 2002."Biological soil crusts Soil biologySoil crustingSoil ecologySoil biology.Soil crusting.Soil ecology.Geological Survey (U.S.)GISGISOCLCQGPOBOOK9910697444903321Biological soil crusts668594UNINA