About 120 pdfs of language learning books - let me now if there are any problems :)
Afrikaans
Teach Yourself Afrikaans
Colloquial Afrikaans
Arabic
Arabic - An Essential Grammar
A Reference of Grammar of Modern Standard Arabic
Albanian
Albanian grammar
Colloquial Albanian
Bengali
Teach Yourself Bengali
Bulgarian
A Short Grammar of Bulgarian
Teach Yourself Bulgarian
Catalan
Teach Yourself Catalan
Colloquial Catalan
Cantonese
Routledge Grammars - Basic Cantonese - A Grammar and Workbook
Routledge Grammars - Intermediate Cantonese - A Grammar and Workbook
Colloquial Cantonese
Chinese
Routledge Grammar - Basic Chinese - A Grammar and Workbook (2nd ed)
Routledge Grammar - Intermediate Chinese - A Grammar and Workbook
Using Chinese Synonyms
Using Chinese - A Guide to Contemporary Usage
Chinese - A Comprehensive Grammar
Modern Mandarin Chinese Grammar - A Practical Guide
Chinese Language(s): A Look Through the Prism of the Great Dictionary of Modern Chinese Dialects
Czech
Czech - An Essential Grammar
Danish
Danish - An Essential Grammar
Danish - An Elementary Grammar and Reader
Teach Yourself Danish
Colloquial Danish
Dutch
Routledge Grammar - Basic Dutch - A Grammar and Workbook
Routledge Grammar - Intermediate Dutch - A Grammar and Workbook
Dutch - An Essential Grammar (second source)
Dutch - A Comprehensive Grammar (second source)
Colloquial Dutch (second source)
Colloquial Dutch 2 (second source)
Hugo in 3 Months Dutch
Hugo Advanced Courses Taking Dutch Further
Teach Yourself Beginner’s Dutch
Teach Yourself Dutch
Teach Yourself Dutch Grammar
English
English - An Essential Grammar
A Student’s Introduction to English Grammar
Colloquial English
Finnish
Finnish - An Essential Grammar
French
Using French Vocabulary
A Student Grammar of French
The Syntax of French
Colloquial French 2
German
Routledge Grammar - Basic German - A Grammar and Workbook
Routledge Grammar - Intermediate German - A Grammar and Workbook
German - An Essential Grammar
Using German Synonyms
The Structure of German
Gujarati
Teach Yourself Gujarati
Colloquial Gujarati
Greek
Greek - An Essential Grammar of the Modern Language
Colloquial Greek
Hungarian
Hungarian - An Essential Grammar
The Syntax of Hungarian
Colloquial Hungarian
Hebrew
Modern Hebrew - An Essential Grammar
Colloquial Hebrew
Icelandic
The Syntax of Icelandic
Colloquial Icelandic
Irish
Routledge Grammar - Basic Irish - A Grammar and Workbook
Routledge Grammar - Intermediate Irish - A Grammar and Workbook
Colloquial Irish - The Complete Course for Beginners
Irish Grammar - A Basic Handbook
Italian
Routledge Grammar - Basic Italian - A Grammar and Workbook
Using Italian - A Guide to Contemporary Usage
Using Italian Vocabulary
Modern Italian Grammar a Practical Guide
Colloquial Italian
Colloquial Italian 2
Indonesian
Indonesian - A Comprehensive Grammar
Indonesian Reference Grammar
Icelandic
Teach Yourself Icelandic
Korean
Routledge Grammar - Basic Korean - A Grammar and Workbook
Routledge Grammar - Intermediate German - A Grammar and Workbook
Using Korean - A Guide to Contemporary Usage
Korean Grammar for International Learners
Colloquial Korean - The Complete Course for Beginners
Latvian
A Short Grammar of Latvian
Teach Yourself Latvian
Colloquial Latvian
Lithuanian
A Short Grammar of Lithuanian
Teach Yourself Lithuanian
Colloquial Lithuanian
Norwegian
Norwegian - An Essential Grammar
Colloquial Norwegian
Polish
Routledge Grammar - Intermediate Polish - A Grammar and Workbook
Polish - An Essential Grammar
A Grammar of Contemporary Polish
Colloquial Polish
Portuguese
Portuguese - An Essential Grammar
Using Portuguese - A Guide to Contemporary Usage
Portuguese (Brazilian)
Colloquial Portuguese of Brazil
Colloquial Portuguese of Brazil 2
Russian
Routledge Grammar - Intermediate Russian - A Grammar and Workbook
Using Russian - A Guide to Contemporary Usage
Using Russian Vocabulary
A Comprehensive Russian Grammar
A Reference Grammar of Russian
Colloquial Russian 2
Romanian
Romanian - An Essential Grammar
Colloquial Romanian
Serbian
Serbian - An Essential Grammar
Teach Yourself Serbian
Spanish
Routledge Grammar - Basic Spanish - A Grammar and Workbook
Routledge Grammar - Intermediate Spanish - A Grammar and Workbook
Spanish - An Essential Grammar
Using Spanish Synonyms
Using Spanish Vocabulary
Using Spanish - A Guide to Contemporary Usage
A Student Grammar of Spanish
Modern Spanish Grammar A Practical Guide
The Syntax of Spanish
Swedish
Swedish - An Essential Grammar
Teach Yourself Swedish
Colloquial Swedish
Thai
Thai - An Essential Grammar
Teach Yourself Thai
Colloquial Thai
Turkish
Turkish Grammar
Turkish - A Comprehensive Grammar
Urdu
Urdu - An Essential Grammar
Welsh
Modern Welsh - A Comprehensive Grammar
The Syntax of Welsh
Colloquial Welsh