The Vintage Childcraft The How and Why Library Complete Set 1-15 from 1988 is a historical book series published by World Book. It is intended for young adults and ages 9-12, providing illustrated reference books on various topics related to history. With its vintage quality and era setting in the 1980s, this set offers valuable educational content in a hardcover format, making it a sought-after addition for those interested in historical knowledge and reference materials.