Licensing of documentation

[Roger Price]

I'm looking for "free as in freedom" documentation on Erlang to use as a
starting point for a project.

I'm assuming that Prentice Hall still has the copyright to "Concurrent
Programming in Erlang - Part 1".  Is this true ?

What is the copyright status of the Erlang 4.7.3 Reference Manual dated
Feb 9th, 1999 ?  The introduction says it "should be useful as a basis for
a future international standardization" which hints at openess, but I
cannot find any copyright statement.

Roger