De Kock, K.N.; Joubert, P.H.; Pretorius, S.J.; Verwoerd, Daniel Wynand
(Published by the Government Printer, Pretoria., 1989)
The present geographical distribution of Lymnaea columella, as recorded in the National Freshwater Snail Collection, is described and discussed. It appears that L. columella is the most successful colonist of all the ...