Note: I am not an attorney. The following are generalizations only based on my study of copyright law and are not meant to be construed as legal advice. If you have a question, consult a competent attorney specializing in copyrights and intellectual property law.
You may not copy an out-of-print work just because you can no longer buy it.
I have a couple suggestions about how to find a chart (they've worked for me, at least!), whether it's out of print or not.
copyright 1997-2003, Martha Beth Lewis