The form
The hands
Left hand then right, as the source writes them. A pianist's voicing routinely carries a colour the chord symbol does not spell — a flat ninth over a dominant, a ninth on top of a seventh chord — so the notes printed under each keyboard are what is actually played, rather than what the symbol alone would predict.
C7
bar 1 · bar 2 · bar 3 · bar 4 · bar 7 · bar 8 · bar 11
LH C2 G2RH E3 Bb3 D4
F7
bar 5 · bar 6 · bar 10
LH F2 C3RH A3 Eb4 G4
G7
bar 9 · bar 12
LH G2 D3RH B3 F4 A4