More critical was the fact that the company had created annual books on every major period in American history.

In the 20th century, there were two major periods of population loss.

The land was shaped, in particular, by two major periods of planning.

"Our research project on any major period of American writing."

The 1970s and 80s were a major period in arena rock.

The dam's major period of significance was 1925 through 1949.

"I had to deal with a major period of adjustment," she said.

There were two major periods of work on the book.

The work was composed in three major periods of his life.

Their major period of activity occurred during the late 1970s through the early 90's.