Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleTesting for trends when there are changes in methodsAuthorsBlick, D. J.; Hjort, R. C.; Newell, A. D.SubjectsPOLLUTIONPublicationWater, Air & Soil Pollution, 1993, Vol 67, Issue 3-4, p457ISSN0049-6979Publication typeArticle