"A work of the United States government, as defined by the United States copyright law, is "a work prepared by an officer or employee" of the federal government "as part of that person's official duties."[1] In general, under section 105 of the Copyright Act,[2] such works are not entitled to domestic copyright protection under U.S. law.

This act only applies to U.S. domestic copyright as that is the extent of U.S. federal law. The U.S. government asserts that it can still hold the copyright to those works in other countries.

Publication of an otherwise protected work by the U.S. government does not put that work in the public domain. For example, government publications may include works copyrighted by a contractor or grantee; copyrighted material assigned to the U.S. Government; or copyrighted information from other sources."

https://en.wikipedia.org/wiki/Copyright_status_of_work_by_th...

Things might be a bit different for this since this falls under the 1976 revision of the law https://en.wikipedia.org/wiki/Copyright_status_of_work_by_th... but I'm pretty sure these guys sorted it out.

Anyhow 79$ is a bit steep considering you need to cough up about 30$ more for shipping to EU even more to Asia...

Would've paid 2-3 times that price to get a replica of the original tho the reprint doesn't look that impressive to me...