- A perfume-making group archive
- A textbook "Introduction to Perfumery" by Tony Curtis et al.
I own a copy of that Curtis book. It's hard to find and expensive though. But it's got 2 chapters discussing perfumery material and extraction.
- Otherwise, for cheaper reads, reading Chandler Burr's and Luca Turin's books where they occasionally contain tidbits of information on the subject you're looking for.