rosteen, even slag can be said to be man made; doesn't make it an artifact. I'm sure your professor can distinguish between sold metal and rock, but it's clearly not an artifact, and besides what are they using to "work" solid metal?
i assumed, maybe incorrectly, that you were fairly new to artifact collecting since Reaper is correct in pointing out all but the full groove axe are ordinary rocks not worked by humans. Happens all the time with beginners. Had a friend find the two best blades I ever saw from in town here. Better then anything I found. Still are, but the rest were rocks. So the Mrs. and I taught him the ropes. Funny thing is he still picks up ordinary rocks, but thanks to us he can find nice artifacts now as well. Compare your two "boatstones" in the center of your table photo with what boatstones actually look like. Can you see a huge difference? You just need someone from your area to teach you the ropes, that's all.
If, as I suspect the two rocks in the center here are your "boatstones", they're just stones that look like a boat hull with a sail, but they are not worked by man, and they are not boatstones. Truly, from what we can see, only the grooved axe is a Native American artifact.