Investigations

These "Investigations" pamphlets are pitched at a variety of levels depending on the topic. 

They were written around 2000 when very little mathematics was available on the internet so to that extent it was original work. Some have subsequently been updated as more information came on-line.

They are mostly designed to be printed A5 size from a standard printer so will conveniently give you two copies whether one page or two.  Select "multiple" and "print both sides flip short edge".