Their reason is emotional but also economic : Kirkuk is the key to oil fields that represent 40 percent of Iraq 's proven petroleum reserves .
Iraq /location/location/contains Kirkuk
PRP$ NN VBZ JJ CC RB JJ : NNP VBZ DT JJ TO NN NNS WDT VBP CD NN IN NNP POS JJ NN NNS .
Iraq
LOCATION
Kirkuk
LOCATION
/location/location/contains