11.   Ms. Hawley said photographs or even paint chips were of dubious value in authenticating the works.

12.   Often, those deals have left the funds holding securities of dubious value.

13.   On the other hand, the study contends, Washington has spent freely on emergency response teams of dubious value.

14.   The ball landed in McCovey Cove, inspiring a half-dozen kayakers to dive into chilly waters to retrieve the wet souvenir of dubious financial value.

15.   The explosives industry complains such measures hold dubious investigative value, could pose safety problems and would dramatically raise costs.

16.   The lipstick always had dubious value but it had cachet.

17.   They would not have taken seriously an explanation based on the premise that any progress Bill Clinton had achieved in talks with North Korea must be of dubious value.

18.   This century has produced an unprecedented shift toward specialization among classical musicians that has been of dubious value.

19.   Yet many advisers say that, for all their allure, the insurance features are of dubious economic value.

20.   Endorsements often have proven of dubious value in American politics.