A number of older, but nevertheless solid Mandarin Chinese textbooks and grammars are now available online for free. The following five textbooks are available as PDF files.

The Analytical Reader: A Short Method for Learning to Read and Write Chinese

Elements of Chinese Grammar

Handbook to Chinese Language

Guide to Chinese Conversation

Grammar of the Chinese Language

Downloadable Mandarin Chinese Courses

If you are looking for additional material for learning Chinese, then consider the Standard Chinese course which includes text and audio.

Digital FSI Standard Chinese: A Modular Approach

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