This is a critical source of water for the district, compromised by silting.
The property tax is a critical source of revenue for the city.
The Internet has already become a critical source of health-care and medical information.
Second, broadcast outlets are still primary, critical sources of information for the American public.
Pennsylvania was a critical source of raw materials to the Union war effort, particularly anthracite coal.
These sectors, especially energy, are a critical source of tax revenue for the Russian Government.
The buying comes as several critical sources of industry growth are slowing.
Too much control can be a bad thing, particularly when innovation is a critical source of competitive advantage.
The social group is a critical source of information about individual identity.
And many activities do little, if anything, to strengthen the back's most critical source of support: the abdominal muscles.