@article {72086,
	title = {Surface Morphology of Columnar Joints and its Significance to Mechanics and Direction of Joint Growth},
	journal = {Geological Society of America Bulletin},
	volume = {99},
	year = {1987},
	note = {Western United States},
	pages = {605-617},
	keywords = {basalt, Columnar joints, Lava, Magma, Volcanic rocks},
	author = {DeGraff, James M. and Aydin, Atilla}
}
