I have several Little Golden Books that are first printings. The pages are somewhat yellowed but the colors are vibrant and all the pages are in tact. There is an ownership name written in them. Does that detract from the value and how do I determine the value if I decided to sell them? Some of the titles I have are: The Three Bears, The Golden Egg Book,, Baby's First Christmas, Lassie and Her Day in the Sun, Leave It To Beaver, plus others. Any help would be appreciated.