51.   A column of civilians came under fire Wednesday and an unknown number were killed in southern Kosovo.

52.   A Pentagon spokesman said there were extensive casualties and an unknown number of fatalities.

53.   A simple monument and tomb, placed near ocean-water collection ponds used for mining salt, holds an unknown number of bodies.

54.   According to Brisbin, there are still unknown numbers of Carolina dogs in the wild, though he said they are rarely seen by humans.

55.   According to Sirrs, another major challenge for the US-led military effort is the unknown number of Taliban and Al Qaeda followers who have fled to Pakistan.

56.   But an unknown number of Ames samples remain outside his collection, at least for now.

57.   But an unknown number of patients still may have unused supplies of the drug.

58.   But an unknown number of them have since returned to Rwanda, hiding among its Hutu majority and launching new attacks.

59.   But for an unknown number of other people, the drugs are failing.

60.   But the unknown number that survived have the potential to severely weaken the bloodline of endangered wild salmon in three Maine rivers.