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Gratz, Norman G ,  Tonn, Robert J ,  World Health Organization. Equipment, Planning and Operations Unit ,  Scientific Group on Integration and Management of Vector Control in Primary Health Care (1986 : Geneva, Switzerland) ,  [The core concept in vector control / by Norman C. Gratz]

Gratz, Norman G ,  Steffen, Robert ,  Cocksedge, William S ,  [Why aircraft disinsection? / Norman G. Gratz, Robert Steffen and William Cocksedge, Désinsectisation des aéronefs : résuméDesinsectación de aviones : resumen]

Gratz, Norman G ,  Tonn, Robert J ,  World Health Organization. Equipment, Planning and Operations Unit ,  Scientific Group on Integration and Management of Vector Control in Primary Health Care (1986 : Geneva, Switzerland) ,  [The core concept in vector control / by Norman C. Gratz]

Gratz, Norman G ,  Steffen, Robert ,  Cocksedge, William S ,  [Why aircraft disinsection? / Norman G. Gratz, Robert Steffen and William Cocksedge, Désinsectisation des aéronefs : résuméDesinsectación de aviones : resumen]