1. Natural matrix standards;Bowen;Environmental Int.,1978
2. Environmental radioactivity measurements and measurements assurance program in Switzerland;Czarneeki;Environmental Int.,1978
3. Status and quality of radiation measurements — food and urine;Easterley;Environmental Protection Agency Report EPA-600-4-043,1977
4. Analysis of quality control samples at EML and contractor laboratories during 1978;Hardy;U.S. Department of Energy Report, Environmental Quarterly EML-349,1978
5. Reference Methods for Marine Radioactivity Studies II;Harley,1975