TY - GEN AU - Virkkula, Aki TI - Field and laboratory studies on the physical and chemical properties of natural and anthropogenic tropospheric aerosol T2 - Finnish Meteorological Institute Contributions VL - 26 SN - 0782-6117 PY - 1999/// CY - Helsinki PB - Finnish Meteorological Institute KW - AEROSOIS KW - IM ER -