White House meetings can often be a useful guide to emerging policy.

The name of a fund may not be a useful guide.

Robert Morris, on the other hand, is a useful guide for people in search of good books.

In this useful guide, parents may find the support they need for a long and often lonely process.

But history cannot be a useful guide to what the mayor will ultimately do.

This early work remains a useful guide to how to read more efficiently.

Nonetheless, the asking price is considered a useful guide to costs.

This has made the book a more useful guide in understanding of the religious disciplines.

Rather, he views the marker as a useful guide to research.

The book turns out to be a surprisingly useful guide to the current crisis.