| The future of bur oak does not promise much after the trees which now remain have been cut. |
| The old bur oak's leaves are now large and leathery, the green acorns nearly the size of golf balls. |
| If you primarily process materials from one of the two groups, equip both bur sets with the same pair of milling instruments. |
| Other weeds, including sand bur and thistle, can also scratch and irritate your skin. |
| But in this early stage of the 21st century, the bur oak still serves important ecological needs. |
| If you wish to bur y the cable with gravel or sand, be careful to place it in an area where it will not be damaged by digging. |
