Lost a Lot of Glass

When cutting my free farm glass before last trip I found that much of it was tempered glass so unusable (cannot be cut).

It is so depressing, I did so much work getting the glass, and then hauling and carrying it around, only to find out the majority was tempered.

Now I need to get rid of that glass, and buy expensive new glass. 

Note* My search for non tempered free glass continues.