4 public-domain matches

Scale And Scaling

Cover of Scale Matters

Scale Matters

Unknown author

Cover of The scale (or ladder) of perfection

The scale (or ladder) of perfection

Hilton, Walter, -1396, John Bernard Dalgairns

Cover of A color notation

A color notation

Albert Henry Munsell

Cover of Daily exercises and scales

Daily exercises and scales

G. Parès