50 pages? I think it is Logic Programming in Scheme: http://t3x.org/amk/

Yes, this is the book and I guess I am replying to the author:) Thank you Nils M Holm. This book is very much on my taste, it contains exactly what it should and nothing more and nothing less. I guess some would prefer the Reasoned Schemer style but I find the dialogue a bit distracting for the first book.

I ordered a paperback from lulu and it was a great decision, I use a marker and write on the margins. It is absolutely worth it.

https://www.lulu.com/en/us/shop/nils-m-holm/logic-programmin...

Thank you! I am glad you liked the book!

Sounds like the reasoned schemer!

The whole series is very high grade. I don't appreciate the dialogue format all the time (too fine grained and a bit distracting after the first book). But high density of knowledge here.

Seriously these are not quick reads. If you don’t feel your conceptual space expanding every few pages you are surely missing something.

I came to them long into my lisp/scheme journey. So maybe it made me impatient.

Yes, I would like to know too.

The book is indeed http://t3x.org/amk/

I ordered a paperback at:

https://www.lulu.com/en/us/shop/nils-m-holm/logic-programmin... in-scheme/paperback/product-1z82nmng.html?page=1&pageSize=4

It was absolutely worth it.

Thanks.