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Yeah that book is one of the most important book in functional world

Anyone know of an online reference with this sort of material? Not huge on book collecting these days, and freer is better.

The Clojure source code for its data structures.

I think its SML in the book

Top result in Bing/Google is a pdf. Not sure if it's a pre-print edition, looks like a PhD thesis.

IIRC, it was originally Okasaki's PhD thesis, then he converted it into a book.

Oksaki's thesis, the basis for the book, is available online for free:

The book itself is available on Kindle.

Awesome.

I am still patiently waiting for a more up-to-date of Okasaki's classic with examples written in Haskell.

The original had all examples written in Haskell, albeit in an appendix.