Finding who owns a copyright

Here's the deal...

I found this great poem by a woman named Muriel Box called "Here Lies A Woman". I want to enter the

poem in this choral competition that's coming up but I need to have authorization to use this woman's text.

She died in the early nineties so I'm pretty sure someone out there still owns it.

How the hell do I find out who does?

Thanks in advance.

Nobody can offer ANY advice on this? Bummer.

Contact the office of Copyrights and see if they can tell you who owns it, if she passed it on to someone else. Here's what the site says:

" As a general rule, for works created after Jan. 1, 1978, copyright protection lasts for the life of the author plus an additional 70 years."

Thanks. I appreciate it.