| new frontier | 10.47 | New frontiers. | ||
| next frontier | 3.23 | The next frontier? | ||
| disputed frontier | 2.63 | Shelling leaves ghost towns on disputed frontier. | ||
| final frontier | 2.63 | The final frontier. | ||
| rugged frontier | 2.17 | He was in the rugged frontier capital of Peshawar on Saturday. | ||
| western frontier | 2.17 | Education i. guardian of ideals Western frontier. | ||
| northern frontier | 1.91 | The situation was very different on the northern frontier. | ||
| last frontier | 1.58 | Alaska is known as the last frontier. | ||
| american frontier | 1.51 | The death of the American frontier. | ||
| electronic frontier | 1.12 | Whatever happened to the electronic frontier? | ||
| common frontier | 1.05 | But differences remain over the exact demarcation of the eastern sector of the common frontier. | ||
| eastern frontier | 0.99 | But the eastern frontier is a source of constant tension. | ||
| national frontier | 0.92 | National frontiers were fiercely guarded by soldiers and customs men. | ||
| pakistani frontier | 0.92 | The meeting was held in the Pakistani frontier city of Peshawar. | ||
| mountainous frontier | 0.86 | The mountainous frontier between Tibet, India and Nepal is almost impossible to police. | ||
| external frontier | 0.79 | Community leaders want to strengthen controls at external frontiers. | ||
| old frontier | 0.79 | And there was a touch of the old frontier. | ||
| afghan frontier | 0.72 | Iran responded by building up its forces along the Afghan frontier. | ||
| wild frontier | 0.72 | But DVD burning still has the rough-and-ready ambience of the wild frontier. | ||
| indian frontier | 0.59 | Her views were shared by many of the villagers along the Indian frontier. |