I have some bones that washed up somewhere along the Mississippi River. I don't know how to identify what kind of bones these are. Can someone look at these and tell me what they are? Thanks

Post's pictures

Screenshot_2015-10-05-15-09-18.png, 2.54 mb, 1080 x 1920

its very difficult to say much in terms of species without a ruler/scale to get an idea of size. the largest fragment top right is the end of the humerus bone (above the elbow).

The articular surface of the humerus fragment suggests this is from a cow.