This work is in the public domain because it was published in the United States between 1978 and February 1989, inclusive, with a defective copyright notice (copyright notice information), and because its copyright was not subsequently registered with the U.S. Copyright Office within 5 years. The copyright notice in this work contains at least one of the following defects:

• Notice does not include the copyright symbol ©, the word "Copyright", or the abbreviation "Copr.";
• Notice is dated more than one year later than the actual date of first publication;
• Notice does not include a named claimant;
• Notice is illegible or concealed from view;
• It is a printed literary, musical, or dramatic work that does not include the year.

A defective notice does not invalidate copyright in cases where the error is immaterial and would not mislead an infringer, such as an abbreviated name. Additionally, foreign works created outside the US are subject to copyright restoration even with a defective notice. It is not in the public domain in the countries or areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, Switzerland, and other countries with individual treaties.