1. Inter-laboratory quality control study of the analysis of water for pesticides;Aspila;J. Ass. Offic. Anal. Chem.,1977
2. Separation of polychlorinated biphenyls, chlordane, and p,p'-DDT from toxaphene by silicic acid column chromatography;Bidleman;J. Ass. Offic. Anal. Chem.,1978
3. High volume collection of atmospheric polychlorinated biphenyls;Bidleman;Bull. Envir. Contam. Toxicol.,1974
4. Field comparison of polyurethane foam and Tenax-GC resin for high volume air sampling of chlorinated hydrocarbons;Billings;Envir. Sci. Technol.,1980
5. Simplified statistics for small numbers of observations;Dean;Anal. Chem.,1951