Columbia subject headings:
Enzyme-linked immunosorbent assay--Technological innovations--United States--Evaluation.
Polychlorinated biphenyls--Analysis--Technological innovations--United States--Evaluation.
Soils--Analysis--Technological innovations--United States--Evaluation.
Harvard subject headings:
Enzyme-linked immunosorbent assay--Technological innovations--United States--Evaluation.
Polychlorinated biphenyls--Analysis--Technological innovations--United States--Evaluation.
Soils--Analysis--Technological innovations--United States--Evaluation.
Princeton subject headings:
Enzyme-linked immunosorbent assay--Technological innovations--United States--Evaluation.
Polychlorinated biphenyls--Analysis--Technological innovations--United States--Evaluation.
Soils--Analysis--Technological innovations--United States--Evaluation.