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U.S. Copyright Office Database: Search a public database of all works registered with the U.S. Copyright Office after Jan. 1, 1978.
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Materials from an Archive or Library Special Collections: It is possible (though not guaranteed) that the library or archive you used has donor information (if the donor was also the copyright holder), or transfer data that accompanied the acquisition of the collection.
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WATCH File: The Writers, Artists, and Their Copyright Holders database contains primarily the names and addresses of copyright holders or contact persons for authors and artists whose archives are housed, in whole or in part, in libraries and archives in North America and the U.K.
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Copyright Clearance Center: Commercial services like the Copyright Clearance Center can, for a fee, streamline the process by searching for the rights holder and securing the license for you.