Sphaerim corneum (L.) and Pisidium spp. Pfeiffer - The ecology of freshwater bivalve mulluscs in relation to water chemistry
Life cycles and distribution of the aquatic gastropod molluscs Bithynia tentaculata (L.), Gyraulus albus (Muller), Planorbis planorbis (L.) and Lymnaea peregra (Muller) in relation to water chemistry
Social conflict and protest in the English countryside in the early nineteenth century: a rejoinder