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• Probleme zootehnice si veterinare (1)
• Probleme zootehnice şi veterinare (2)
• Problemi filosofii (1)
• Problemi na geografijata (1)
• Problemi na tehničeskata kibernetika (1)
• Problemi na techničeskata kibernetika i robotikata (1)
• Problemi na zaraznite i parazitnite bolesti (1)
• Problems in anesthesia (1)
• Problems of Agricultural Economics (1)
• Problems of control and information theory (1)
• Problems of diffraction and spreading of waves (1)
• Problems of geography (1)
• Problems of ichthyology (1)
• Problems of Infectious and Parasitic Diseases (1)
• Problems of information transmission (1)
• The Problems of Literary Genres (1)
• Problems of virology (1)
• Problemy difrakcii rasprostranenija voln (1)
• Problemy Dynamiki Maszyn (1)
• Problemy èkonomiki (1)