D. Markovchick

Distribution of selected herbicides and nitrate in the Mississippi River and its major tributaries, April through June 1991

D. Goolsby, R. Coupe, D. Markovchick, 1991 .

Reconnaissance of contaminants in larval Pacific lamprey (Entosphenus tridentatus) tissues and habitats in the Columbia River Basin, Oregon and Washington, USA.

Brian J. McIlraith, E. Nilsen, D. Markovchick, 2015, Environmental pollution.

Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory; determination of triazine and other nitrogen-containing compounds by gas chromatography with nitrogen phosphorus detectors

J. Lewis, J. L. Iverson, D. Markovchick, 1994 .