61 books • 6 series
Work Toward Knowing
Mississippi (Discoveries... America S.)
Mark Twain's "Hannibal" (Discoveries... America S.)
Georgia (Discoveries... America S.)
New Mexico (Discoveries... America S.)
Florida (Discoveries... America S.)
South Dakota (Discoveries... America S.)
Driftboat Fishing 101 (How to Fly Fish S.)
Nebraska (Discoveries... America S.)
Wall Drug (Discoveries... America S.)
Pioneer Auto Show (Discoveries... America S.)
Tulips (Discoveries... America S.)
Iowa (Discoveries... America S.)
Missouri (Discoveries... America S.)
Colorado River (Discoveries... America S.)
Mark Twain Himself (Discoveries... America S.)
Matchstick Marvels (Discoveries... America S.)
SuperMuseum (Discoveries... America S.)
Illinois (Discoveries... America S.)
Michigan (Discoveries... America S.)
Ohio (Discoveries... America S.)
Delaware (Discoveries... America S.)
Virginia (Discoveries... America S.)
Louisiana (Discoveries... America S.)