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Aquifer Type Codes

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# National Water Information System
# 2017/08/17
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# Date Retrieved: USGS Water Data for the Nation Help System
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Code	Description
1s	49s
C	Confined single aquifer
M	Confined multiple aquifers
N	Unconfined multiple aquifer
U	Unconfined single aquifer
X	Mixed (confined and unconfined) multiple aquifers