title: A multi-laboratory comparative study of spore trap analyses.
authors.affiliation: Occupational and Environmental Health Consulting Services Inc., 635 Harding Road, Hinsdale, Illinois 60512, USA. ldr@iecinc.net
authors.forename: L D
authors.initials: LD
authors.lastname: Robertson
authors.forename: Robert
authors.initials: R
authors.lastname: Brandys