Some works by this author are in the public domain in the United States because they are works of the United States federal government (see 17 U.S.C. 105). However, the US governmental agency may still claim the copyright of works of the United States federal government in other countries and areas. Even so, this work may still be in the public domain in other countries and areas if:
- Other countries and areas apply the rule of the shorter term to United States works. OR
- Other countries and areas exclude official works from copyright. OR
- Any valid copyright outside the USA has expired in any other countries and areas.