Satchel & Supplies (retired)

I got the piece I most wanted from this set, the Union Reader from a board member. Mine has a laminated cover, which struck me as odd since none of the other paperback schoolbooks have it. Does anyone know if this is normal, or something someone did to preserve the book better? I love this book (no surprise there, I love them all). It is a detailed readable miniature of the original book, and the back cover is an ad for Webster's Dictionaries. A
This is the histoical mini books in chronological order. Bedtime books on top, school books on the bottom.