In answer to your query : copyright registration of poetry.

Bibliographic Details
Corporate Author:	Library of Congress. Copyright Office
Format:	Government Document Book
Language:	English
Published:	Washington, D.C. (101 Independence Ave., S.E. Washington 20559-6000) : Library of Congress, Copyright Office, 2000]
Subjects:	Copyright > United States.
Online Access:	PURL accesses list of copyright information circulars, etc. from which a link may be made to the title desired

Available Online