an international directory : A classified guide to current foreign and domestic serials, excepting periodicals issued more frequently than once a year
(1967)
Proceedings of the Research Co-ordination Meeting on the Use of Isotopes and Radiation in Studies of Parasitic Diseases in Domestic Animals ...org. by the Joint FAO/IAEA Div. of AEFA, Vienna, 2 - 6 June 1969
(1970)
![Национална конференция с международно участие на тема: „Биологични растениевъдство, животновъдство и храни”, [27-28 ноември 2014 г., Троян] [Електронен ресурс] : доклади, постери](https://eclipse.agriacad.bg/storage/img/52/1006/T0156348.jpg?1788914030)