Shop › A Key to the Adults of the British Emphemeroptera. SP47. JM Elliott & UH Humpesch Image 1 of 1 A Key to the Adults of the British Emphemeroptera. SP47. JM Elliott & UH Humpesch £10.00 Add To Cart Added! You Might Also Like Guide to British Freshwater Macroinvertebrates for Biotic Assessment - SP67 Freshwater Biology and Ecology Handbook (paperback copy) A Guide to Estimating Microbial Numbers and Biomass in fresh water - SP39 Assessing the biological quality of freshwaters: RIVPACS and other techniques - SPEC08 Freshwater Biology and Ecology Handbook (digital copy)