A nice touch is the illustrated review section at the end of each unit.
F8 Crusader in Action Aircraf – ACCEPTABLE
You will find that this unbranded textbook is easy to pack in a backpack.
The D7 Tractor : A Visual History of the D7 Tractor in U. S. Army Service 1941-1
The illustrations are not just pretty—they actually teach you something.
The Eighty-Eight German 8.8 Cm Flak Guns In WWII By David Doyle
What stands out about this textbook is the inclusion of historical context.
