Document revision history
The scientific and editorial content of this publication, in both printed and on-line format, has been approved by normal USGS review procedures.
- April 1998-- First printing and web version made public
- 6 October 1999-- Second printing
Changed text and table in section 'Lead, Zinc, and Other Trace Elements' (pages 12-13)
Updated PDF accordingly
- In table, changed four values for lead and zinc in bed sediment.
- Changed text in two consecutive paragraphs beginning 'Concentrations of lead and zinc in bed sediment were highest....' and 'Lead concentrations in bed sediment were substantially higher....'
- PDF of original pages 12-13 (146 Kb)