rogerch It's amazing what the editors of these books call "Easy"!
This! 😆👍
And this is the reason Christian Fuchs had named the first 16 Blues lessons "for Beginners", and after this he named it "Easy". For beginners (bloody, total, early, or real beginners, you name it), "easy" is really hard.
Btw, thanks to @plop_symphony I found a series of books for a reasonable price. (also available at amazon.bavaria)
Improve Your Sight-Reading! Piano Grades 0, 1/2 , 1-8 from Paul Harris, Faber publishing.
And it is available as paperback and kindle versions.
Updated this list: WieWaldi