Centuries: 7th century - 8th century - 9th century
Decades: 690s 700s 710s 720s 730s - 740s - 750s 760s 770s 780s 790s
Years: 740 741 742 743 744 - 745 - 746 747748 749 750
... States Geological Survey
The United States Geological Survey (USGS) is a U.S. government agency that studies and monitors the geology of lands in the United States. ...
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