interim Report Forest Pathology Laboratory Maple, Ontario, (Based on Investigations carried out in 1928 and 1954) Haddow, W.R. creator Hill, A.W. text Canada Dapartment of Agriculture Science Service c1954 monographic 68p. 3 leaves of plates : Ill. ; maps Patholgy Forest Ontario SB741.R8 H3 UOEL 000 20150624102351.0