Again, a useful summary of some of the tech issues from 2011.

A useful summary of different systems and their features.

The letter includes a useful summary of the Armenian contribution to the allied war effort.

Granted it's a novella compared to the full 440 page report, but it is still much too long to be a useful summary.

Hart's Book selection and use in academic libraries provides a useful summary of recent literature.

Robertson, a historian and poet, provides a useful summary of the conventional wisdom.

A useful summary of this tradition, its literature, and historiography may be found in Wedemeyer 2007.

A useful summary of such data is the population pyramid.

But his sections on 'towards anti-discriminatory practice' at the end of each chapter are useful summaries.

Ratios can provide useful summaries of relative efficiency or progress.