Using the search term "Tribune" and setting the search limit to 1987, the only entry that appears is "A Gallery of Tribune Media Services comics : incl. strips, panels, and puzzles." The registration is for works in a serial that is published weekly as indicated by "Frequency: Weekly." The Tribune, Oakland, CA is published daily, so the entry does not refer to the newspaper in question. Thus there are no copyright registrations for The Tribune, Oakland, CA in 1987.
There are no copyright registrations under the name "Reginald Pearman".
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This work is in the public domain because it was published in the United States between 1978 and March 1, 1989 without a copyright notice, and its copyright was not subsequently registered with the U.S. Copyright Office within 5 years.
Unless its author has been dead for several years, it is copyrighted in the countries or areas that do not apply the rule of the shorter term for US works, such as Canada (50 pma), Mainland China (50 pma, not Hong Kong or Macau), Germany (70 pma), Mexico (100 pma), Switzerland (70 pma), and other countries with individual treaties. See this page for further explanation.
Uploaded a work by Reginald Pearman / The Tribune from [https://www.newspapers.com/article/oakland-tribune-jon-jang/124712407/ The Tribune, Oakland, California] with UploadWizard