I don`t think any angling book collection is complete without the three prized additions from the Colins New Naturalist stable, although rare now and out of print
Number 15, Macan T.T. & E.B. Worthington, (1951) Life in Lakes
Number 23, Harris J.R. (1952) An Angler`s Entomology
Number 75, Maitland P.S. & Campbell R.N. (1992)Freshwater Fishes