por Hobbs, Betty C. (Betty Constance) [autor].
por Hobbs, Betty C. (Betty Constance) [autor] | Ducar Maluenda, Pedro [traductor] | Gilbert, Richard J [autor] | Hobbs, Betty C. (Betty Constance). Food posoning and food hygiene.
por Hobbs, Betty C. (Betty Constance) [autor] | Roberts, Diane [autor] | Ducar Maluenda, Pedro [traductor].