[gutvol-d] "Lady Chatterly's Lover" public domain in the U.S.?

Everyone, Even though D.H. Lawrence's "Lady Chatterly's Lover" was published in 1928, some of the publishing details in the following web site indicate the possibility it may be public domain in the U.S.: http://web.ukonline.co.uk/rananim/lawrence/lcl.html Anyone have more knowledge on the U.S. public domain status of this work? Jon