All the images in this directory are public domain in
the United States. Other countries are different, so
if you are using a computer in the US to access this via the
internet, please check your local laws.

http://www.unc.edu/~unclng/public-d.htm
 

Published before 1923: 	In public domain 

Published from 1923 - 63: 	
(a) When published with notice (Under the 1909 Act, works published 
without notice went into the public domain upon publication. 17 U.S.C.) 
28 years + could be renewed for 47 years, now extended by 
20 years for a total renewal of 67 years. 
(b) If not so renewed, now in public domain.

Therefore all works published before 1941