Axelrod, D.I., 1979, Age and origin of Sonoran desert vegetation: California Academy of Sciences Occasional Paper 132, 74 p. Authors Axelrod, D.I. Publication Date 1979 Citation California Academy of Sciences Occasional Paper 132, 74 p. State AZ Province BR TR County MP LP YU YA MA PM GI PN GM GN CH Keywords Biogeology More Keywords Biogeology, AzGeoBib RefNum 544