J. Hardy

Plutella maculipennis , Curt., its natural and biological Control in England

J. Hardy, J. Eliot Hardy, 1938 .

Chemical control of insects

T. F. West, J. H. Ford, J. Hardy, 1953 .

Natural control of Diprion similis Htg. in Poland during 1936.

J. Hardy, 1939 .