Audio-visual aids 20 Self-instruction -- 20 Study and teaching -- 16 English 8 English language -- 7 Sound recordings for English speakers 7 Chinese language -- 5 more ... French language -- 5 German language -- 5 Sound recordings 5 Conversation and phrase books -- 4 Avian influenza -- 3 Disease outbreaks 3 Game 3 Influenza, human -- 3 Popular works 3 Spanish language -- 3 Transmission 3 Arabian language -- 2 Audio visual aids 2 Conversation and phrase book -- 2 Grammar 2 Arabic language -- 1 Comprehension and pronunciation -- 1 Conversation and phrase books 1 Conversation and text book -- 1 Dictionaries -- 1 Foreign speakers 1 French 1 French -- 1 less ...