Vitamin B12 Blood Levels Range and Test Results. Normal values of vitamin B12 in blood are between 200 to 900 picograms per milileter. Talk to your lab and request the specific values since every lab values ânormal rangeâ differently.However, these values arenât exactly correct because many people have been diagnosed with B12 deficiency even when their B12 levels were within the normal range.alk to your lab and request the specific values since every lab values ânormal rangeâ differently. However, these values arenât exactly correct because many people have been diagnosed with B12 deficiency even when their B12 levels were within the normal range.
The earliest settlers mined coal among the hills of south central Iowa. They used coal to heat their homes and cook their food in areas were timber was not available. Not until 1870 did the industry of coal mining begin to rapidly grow in Iowa. By that time the major Iowa railroads reached from the Mississippi River in the east to the Missouri River in the west. The railroads leased land in coal producing areas and operated mines which produced coal for the use of the railroads.
Coal is extracted from the ground by coal mining. Since 1983, the world's top coal producer has been China. In 2015 China produced 3,747 million tonnes of coal â 48% of 7,861 million tonnes world coal production. In 2015 other large producers were United States (813 million tonnes), India (678), European Union (539) and Australia (503).