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By: Dellacasa, Marco - Gordon, Robert Donald - Dellacasa, GiovanniType: ArticleIn: Instituto de Ecología A.C.Volume:Series:Issue:Date: 2000-01-01Page Range:Publication Info: Instituto de Ecología A.C.Subjects: Aphodiidae Aphodius freyi Cephalocyclus mexicanus Cephalocyclus pullatus Coleoptera Mexico