Nils has release all of his works for free, asking that if you wish to provide some sort of compensation that you commit to any number of practices listed on his site. Everything is explained here.
(via comp.lang.scheme)
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Hi Grant, link is broken. Any way you can find a replacement?
Cheers,
Paulo Matos
Hi Paulo. It looks like they are no longer available. Perhaps it was a “limited time offer”?
Here is another place to find them at a very reasonable price:
http://www.lulu.com/browse/search.php?search_forum=-1&search_cat=2&show_results=topics&return_chars=200&search_keywords=&keys=&header_search=true&sitesearch=lulu.com&q=&fSearch=Nils+Holm&fSearchFamily=0&fSubmitSearch.x=0&fSubmitSearch.y=0
Thanks Grant