Example sentences of "period [prep] fifteen years " in BNC.
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| 1 | The definitive work on sleep norms at different ages is by Robert Williams , Ismet Karacan and Carolyn Hursch from the Florida Sleep Laboratory who recorded the normal sleep patterns of over 200 subjects between three and seventy years of age and older over a period of fifteen years . |
| 2 | It did suggest that the principles of confidentiality should be preserved for a period of fifteen years instead of thirty , but that there should be no new machinery for enforcement since offenders would carry the risk of social and political sanctions , and , of course , if they came within the rubric of any existing legal restraint , such as the Official Secrets Act , they would run the risk of legal proceedings . |
| 3 | Cameron first worked for Catherine at the palace of Tsarskoe Selo , to which he made several additions over a period of fifteen years , notably the Agate Pavilion and the Cameron Gallery , an elegant building based on the neo-classical style developed in England by Robert Adam , about which Cameron had probably learned from Clérisseau . |
| 4 | Over a period of fifteen years he noted that not only were the ridge and furrow patterns of each individual 's prints unique , but that they never changed . |
| 5 | Forecasting employment land requirements over a period of fifteen years is of course a difficult exercise at any time . |