I'm looking for physical books, not e-books. I'm looking for DMT tree and plant identification books and DMT organic extraction books if there are any. I'd rather read from a book than from the computer screen, that's why I want the books.

This is likely what you are looking for.

As for alkaloid extraction, any intro level chemistry textbook should cover that. You might find this more geared toward your specific area of interest though. Disclaimer I have not read this one so I'm not really familiar with the contents.

Doubt many books are around regarding xtraction. One could be written in under a dozen pages.