| There are 85 million Americans in their forties who represent an untapped market for classic soul. |
| Probably the largest untapped source of bioenergy is the organic content of urban and industrial refuse and sewage. |
| They are the great untapped source of power for aspiring politicians, the potential power behind the throne. |
| Exciting untapped resources are the deep-sea vents occurring along ocean ridges, such as the East Pacific Rise and the Galapagos Rift. |
| Microgeneration remains largely untapped, and needs to be given much greater priority by the Government, local authorities and industry. |
| Thousands of acres of rubber trees were left untapped and untended, as the ruling price then could not meet even the labour cost. |
