It analyzes the town in great detail over a thirty-year period from 1294 to 1324.

The bonds were to be redeemed at 20 percent of face value over a thirty-year period.

Meanwhile, over the same thirty-year period the economy has been stagnant in job creation and income growth for the middle class.

The church and almost all its sculpture and paintings were created within the same thirty-year period.

Walpole added new features over a thirty-year period, as he saw fit.

The eighth is the largest, containing works written over a thirty-year period.

The Reagan Administration in the early 1980s began a thirty-year period of financial deregulation.

They were selected by the author to represent the best of her work over a thirty-year period from the 1910s or 1920s.

More recently, the population in all three major population regions have shown sustained growth over the past thirty-year period.

Over a thirty-year period from 1945-1975 her work was seen in more than one hundred one-person and group exhibits.