| The keystones of the arches bear inscriptions indicating their precise location within the structure. |
| We must be careful, however, not to paint a picture of historical evidence that suggests that newspapers are the keystones of such documentation. |
| Risk management and evidence based medicine are keystones of clinical governance. |
| In the past, large crews on our ships were the keystones to accomplishing their missions. |
| Each wall contains a walk-through arch marked by massive keystones that were hand worked onsite. |
| It is only after close study that apparent solecisms can be interpreted as the keystones of a highly conscious literary construct. |
