These books are part of the J installation online help. The links here are for the J601 release.
Primer
If you are new to J and want to be a J programmer, reading the Primer is a good place to start. Even if you have considerable programming experience, there is much that is unique to J, and it is worthwhile to at least skim this book before jumping into the deep end.
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PrimerDictionary
The Dictionary is the authoritative and definitive specification of the J language. It can be used to learn J, but the fact that it covers all of the language concisely, yet completely and rigorously, with more emphasis on the complex than the mundane, means that most beginners should start with the introductory books.
Roger K W Hui, Kenneth E Iverson - Copyright Jsoftware
A Russian translation is available. See Konstantin Metlov's note on the Links page.
User Manual
Documents the J programming environment, IDE (interactive development environment), the utiltity and tool library, and various other topics such as GUI programming and debugging.
Release Highlights and Overview
Lists the main changes in a release.
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Release Highlights and Overview.
Release Notes
Lists the changes in the core language.