Ecological Reference condition project:
Field-manual. General information, catchment condition, invertebrates and water chemistry. (pdf 237 kB)
Table of Contents (pdf 9 kB)
Introduction (pdf 26 kB)
Site information (pdf 24 kB)
Catchment conditions and land-use (pdf 41 kB)
Field-based data for each sampling visit (pdf 25 kB)
References (pdf 7 kB)

for citation purposes:
NAEBP Report Series No 10
Dallas, H. F. 2000.
Ecological Reference condition project: Field-manual. General information, catchment condition, invertebrates and water chemistry.
Institute for Water Quality Studies, Department of Water and Sanitation, Pretoria, South Africa.