Together, they contribute unique and valuable perspectives and provide a comprehensive vision for each issue's focus.

Fred Cook's book provides valuable historical perspective, but is out of print.

Even so, his argument opens up a valuable perspective for architects who must design for a pluralistic society.

And it suggested that a valuable perspective on the issue would come from women able to choose the best available roles.

It also, he admitted, had offered him a new and valuable perspective on Harrington herself.

It would provide a valuable perspective on the views that they hold.

It seems to have led to his book and to its valuable but limited perspective.

But how many offer a truly valuable perspective?

This would have been a valuable perspective at the outset, not at the end.

However it does provide a valuable historical perspective on the modern polyamory movement.