Cockroaches 1 Collembola (springtails) 1 Dermaptera (carwigs) 1 Dictyoptera (cockroaches and mantises) 1 Dissertations, Academic (Ph.D) 1 Entomology 1 Listeria-Pathological aspects 1 Orthoptera (cricketsand grasshoppers) 1 Periplanata americana 1 Thesis (Ph.D)-Microbiology 1 Thysanoptera (thrips) 1 cockroach 1 insevcts 1