1. Biological effect-test systems for the early recognition of unexpected environmental changes

   • L. Peichl
   • D. Reiml

   Bioprobes Pages: 1 - 12

2. GC-MS identification of gaseous volatiles in wastewater

   • Lawrence C. C. Koe
   • N. C. Tan

   OriginalPaper Pages: 13 - 24

3. Monitoring and assessment of soil and forage molybdenum near an atmospheric source

   • Michael R. Murray
   • Dale E. Baker

   OriginalPaper Pages: 25 - 33

4. The relationship between water quality and caddisfly assemblage structure in fast-running rivers. The River Cadagua basin

   • A. Basaguren
   • E. Orive

   OriginalPaper Pages: 35 - 48

5. Sulfate and conductivity as field indicators for detecting coal-mining pollution

   • Michael Rikard
   • Sam Kunkle

   OriginalPaper Pages: 49 - 58

6. Causes of temporal variability of lead in domestic plumbing systems

   • Michael R. Schock

   OriginalPaper Pages: 59 - 82

7. Within-and among-clutch variation of organochlorine residues in eggs of black-crowned night-herons

   • Thomas W. Custer
   • Grey Pendleton
   • Harry M. Ohlendorf

   OriginalPaper Pages: 83 - 89

8. Organochlorines and selenium in California night-heron and egret eggs

   • Harry M. Ohlendorf
   • Katherine C. Marois

   OriginalPaper Pages: 91 - 104

9. Book review

   • Steven G. Paulsen

   BookReview Pages: 105 - 106

10. Announcements

    Announcement Pages: 107 - 109