... It probably has asbestos. The glue and/or the flooring may have it. Take a sample of both to your Health Department for testing. Once you determine what you have, if you have asbestos, maybe they have some literature on how to remove (AND dispose of) it. If now, come back here and we'll offer some help.
In the meantime, leave it be. My best to ya and hope this helps.
PS: After this afternoon, I won't be back until MOnday morning. 'Other Follow-uppers' will be around ...