Title: II [i.e. Vtoroĭ] Vsesoi͡uznyĭ simpozium po bolezni͡am i parazitam vodnykh bespozvonochnykh, Leningrad, 28-30 i͡anvari͡a 1976 g
Subjects: Aquatic invertebrates, Congresses, Diseases, Parasites