Thanks for the pic, coolthings.
Was looking for "beveling", but hard to make it out.
I suspect the two pts. on the left may have been small, hafted knives.
Both have the appearance of being sharpened down to the stick.
The first one may ? have beveling, and the second one appears to have been resharpened 3 or 4 times.
When they get to the point of looking like a drill, they are most likely used up knives, and discarded as such.
The middle piece may be Burlington Chert. Illinois, Iowa, and Missouri ... especially Missouri.
I think the right hand piece may be the oldest of the three ... knife or atlatl dart point, hard to say.
Made of Hixton Silicified Sandstone and most likely the northern most of the three, coming from Wisconsin.
Edit: All pure speculation, ha-ha.
It's also possible the first one may be a dalton variant, which would make it a very old style, as well.