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Challenging Problems in Geometry (Dover Books on Mathematics) - VERY GOOD

Challenging Problems in Geometry (Dover Books on Mathematics)

Challenging Problems in Geometry by Posamentier, Alfred S.; Salkind, Charles T.

Challenging Problems in Algebra (Dover Books on Mathematics)

Excursions in Geometry (Dover Books on Mathematics)

Challenging Problems in Algebra (Dover Books on Mathematics) - VERY GOOD