1. ‘Delicious Spot’ on apples due to ‘Gloeosporium perennans’;Brien;New Zealand J. Agric.,1932
2. Some pathological studies on apple cankers;Brown;Phytopathology,1932
3. The relation of Woolly Aphis to Perennial Canker infection with other notes on the disease;Childs;Bull. Oregon Agric. Coll. Exp. Sta.,1929
4. Relation of Perennial Canker to its environment;Cooley;Phytopathology,1931