These books are well written and easy to read for the ages listed. The author skillfully provides just enough information to keep the reader interested. Details and some names are left out as this is written for a younger audience, but all major events are covered. Illustrations compliment the text. The text is written at about 20pt. font for easy reading and each book is only 15 pages long. When you buy the set, it comes in a very nice, sturdy box with magnetic closure. The only con is that each booklet is made of workbook quality binding and I can see them getting bent easily over time. I highly recommend this product.