You gave me an idea: 'does out of print mean out of copyright?'. It looks like it might. Google 'Death of Grass text' and you can get the novel on-line to print.
The Sock
Out of print does not mean out of copyright. A book (or audio/video) can go out of print very quickly but the copyright lasts decades. On the other hand, there are a few movies that were never copyrighted (Suddenly, with Frank Sinatra, is a good example) but are still in print and cheap. Anyway, copyright and in or out of print are unrelated.
Wheels