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#	Keyword	Results	Change	Check Date
4	history of coal mining techniques	1 270 000	0	2014-09-26
7	xcel colorado service territory map	4 340	0	2014-10-29
7	Xcel Energy Service Territory Map colorado	50 800	0	2014-09-10
11	xcel service areas colorado	478 000	0	2014-10-30
16	tight sand gas	6 890 000	-9	2014-02-05
24	nolans rare earth	153 000	0	2014-10-07
24	oil field data handbook pdf	2 600 000	0	2014-08-12
33	questar oil and gas	127 000	0	2014-11-14
36	room and pillar	3 720 000	-15	2014-09-29
42	tight gas	12 000 000	-2	2015-03-10
49	continuous mining equipment	10 600 000	0	2013-11-16