99 Bottles of Beer on the Wall
   Limbo version.
   http://99-bottles-of-beer.ls-la.net/l.html#Limbo

A Descent into Limbo
   Article by Brian W. Kernighan.
   http://www.vitanuova.com/inferno/papers/descent.html

An Analysis of Inferno and Limbo
   By Kim Nyberg. Paper presents, discusses, compares Inferno network OS and its Limbo language: history, precedents, motives, goals, main features; similarities, differences to Java OS, Java. Bibliography. Helsinki University of Technology.
   http://www.cs.hut.fi/~kny/inferno/

Limbo 2.0 SDK References
   Language basics, programming guide and language definition.
   http://agni.csa.iisc.ernet.in/OperatingSystems/Inferno/Limbo_Ref20/

Limbo Manual
   Language definition (January 1997).
   http://www.cs.rit.edu/~ats/inferno/limbo/

Limbo Programming Language
   Growing article, with links to many related topics. Wikipedia.
   http://en.wikipedia.org/wiki/Limbo_(programming_language)

Programming in Limbo
   In BYTE Magazine, sec. Core Technologies.
   http://www.byte.com/art/9710/sec4/art5.htm