na INLIS000000000003784 Ind 0010-1118003784 Fish populations and invertebrates in some head waters of the River Dee and Spey, 1983-1985 MORRISON, B.R.S. B.R.S. Morrison and R. Harriman Torry The scotish Office Agric. and Fisheries Departement 1992 19 p.: ill.; 30 cm.-- 19 p.: ill.; 30 cm.-- 639.2.053.2 FISHES INVERTEBRATES POPULATION DENSITY 825/MS/93