298,121 SIEGMUND O. H. [red.] "Recent developments in the control of animal parasites" : Proceedings of the MSD AGVET Symposium : August 25 and 26, 1983 : in association with the XXII World Veterinary Congress Perth, Australia / ed. by W. H. D. Leaning, 0. H. Siegmund and C. M. Fraser. - [Rahway, NJ : MSD AGVET Division of Merck and Co., Inc., 1983]. - [3], 302 s. : wykr. ; 29 cm