11.   Reliable estimates for the size of the industry that serves the disaster and long-term relief market do not exist.

12.   Silverman said no one has reliable estimates on how many Internet servers actually are being sold.

13.   The absence of reliable estimates of future costs also prevents Congress from providing adequate funding for system improvements, the GAO said.

14.   The IRS still cannot provide a reliable estimate of the number of missing Schedule Ds, though Roberts indicated the earlier estimate exceeds the realm of possibility.

15.   There is no reliable estimate.

16.   There is no reliable estimate as to how much time and effort the president and his staff have devoted to the issue.

17.   There are no reliable estimates of how many rebels have died, or even how many rebels there are.

18.   There are no reliable estimates of the number of Russian and Chechen prisoners of war, but each side has accused the other of summary executions and ill-treatment.

19.   There are no reliable estimates of the number of squatter settlements that have sprung up in recent months.