title: A system for appraising airborne populations of pollens and spores.
mesh_terms: D000391:Air Microbiology / Q000032:analysis; D001412:Bacillus subtilis / Q000032:analysis; D001431:Bacteriological Techniques; D008722:Methods; D011058:Pollen / Q000032:analysis*; D013170:Spores / Q000032:analysis*