cross country ski info?

I was always interested in getting into cross country skiing. I just came across these old skiis (for free) and now looking for boots to match . Is anyone familiar with what type of boots i should be looking for?
I can see the blue skiis use nnn bindings
but whatabout the wooden skiis?
is that a 3 pin binding?
is the binding missing the heel strap I sometimes see?

Attached Images

	ski1.jpeg (94.6 KB)
	ski2.jpeg (86.2 KB)
	ski3.jpeg (128.1 KB)