books.google.com - A small fraction of the global terrestrial molluscan diversity exhibit high propensities for passive dispersal associated with human trading activities and invasiveness when introduced to new areas. They have become increasingly important as crop pests in agriculture and as vectors of helinth parasites...http://books.google.com/books/about/Natural_Enemies_of_Terrestrial_Mollusks.html?id=bjAh_Gszsy8C&utm_source=gb-gplus-shareNatural Enemies of Terrestrial Mollusks
