RT Journal Article SR Electronic T1 Atmospheric pollen and fungal spores in Hamilton in 1972 estimated by the Hirst automatic volumetric spore trap JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 659 OP 661 VO 110 IS 6 A1 Chatterjee, J. A1 Hargreave, F. E. YR 1974 UL http://www.cmaj.ca/content/110/6/659.abstract