Self-instruction English 42 Grammar 39 French language 38 Study and teaching 33 English language 32 Textbooks for foreign speakers 25 Spanish language 21 Conversation and phrase books 17 German language 17 Chinese language 16 Audio-visual aids 13 Problems, exercises, etc 11 Sound recordings for English speakers 10 Arabic language 9 English speakers 9 Foreign speakers 9 Japanese language 8 Methods 8 Sound recordings for foreign speakers 7 Spoken French 6 Conversation and phrase book 5 Guitar 5 Piano 5 Composition and exercises 4 Computer-assisted instruction 4 Italian language 4 Mandarin language 4 Software 4 Sound recording for speakers 4