id	keyword
esrj-21109	sandstone
esrj-21109	vol
esrj-21109	shale
esrj-21109	mamu
esrj-21109	formation
esrj-21109	ajali
esrj-21109	basin
esrj-21109	enero
esrj-21109	study
esrj-21109	environment
esrj-21109	enugu
esrj-21109	nigeria