Copyright

Does anyone understand copyright? We are using a 1921 edition Uncle Remus, His Songs and His Sayings (the Uncle Remus Legends of the old Plantation), and have enjoyed reproducing the wonderful illustrations in past translation efforts as in the public domain. We believe they are, by now, public domain. Is that right? We may or may not continue- or put in a more occasional illustration, in hopes the earlier ones encourage people to look them up. - 70 years long gone. Why should We The People be deprived of our heritage after that?