BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
The Star Wars: Return of the Jedi Coloring Book was published by Kenner Products in 1984. It shares the same title with two other coloring books published by Kenner in 1983, one featuring Max Rebo on the cover and another featuring Luke Skywalker. This particular coloring book features Lando Calrissian on the cover and is identified by the product number 19350.