## The Book of Cross Numbers

A free book of 66 cross numbers (here) originally created with X-figure PC program (now available...

A free book of 66 cross numbers (here) originally created with X-figure PC program (now available...

I’ve learnt a lot about mathematics and its history around the world from these books. Of...

All published by ATM costing £50+ (£40+ for members). Recommend all of them, available...