Copyright information of the webpage of the Bureau of Labor Statistics USA

I really like the copyright, The Bureau of Labor Statistics (BLS) in USA, has on their material on the website. Everything with public domain (except on material when it is not possible). It means peopla are free to use their material without specific permission. Although they ask people using it to cite the Bureau of Labor Statistics.

Screenshot from the webpage of The Bureau of Labor Statistics in USA about copyright of their materials