Thank you for your question. I happen to be a licensed Pennsylvania professional. Please permit me to assist you with your concerns.
It is always a risk to reproduce and fully republish someone else's work. If you do not obtain permission and simply publish, there is a very strong chance that the real owner of the poem could claim copyright infringement and consequently sue you for damages. If you cannot find information on the poem, do not publish it. This is a 'better safe than sorry' approach because if you end up publishing someone else's work without them consenting, you would have a very potentially expensive lawsuit on your hands, and one that you are unlikely to prevail from.
DISCLAIMER: Answers from Experts on JustAnswer are not substitutes for the advice of an attorney. JustAnswer is a public forum and questions and responses are not private or confidential or protected by the attorney-client privilege. The Expert above is not your attorney, and the response above is not legal advice. You should not read this response to propose specific action or address specific circumstances, but only to give you a sense of general principles of law that might affect the situation you describe. Application of these general principles to particular circumstances must be done by a lawyer who has spoken with you in confidence, learned all relevant information, and explored various options. Before acting on these general principles, you should hire a lawyer licensed to practice law in the jurisdiction to which your question pertains.
The responses above are from individual Experts, not JustAnswer. The site and services are provided “as is”. To view the verified credential of an Expert, click on the “Verified” symbol in the Expert’s profile. This site is not for emergency questions which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service (last updated February 8, 2012).