include citation information

Author: soggyheron

USGS_WaterUseStatistics_Summary_CONUS_humanUses.ipynb

@@ -59,7 +59,12 @@
     "Sources:\n",
     "\n",
     "https://water.usgs.gov/watuse/data/\n",
-    "USGS data is in the Public Domain."
+    "USGS data is in the Public Domain.\n",
+    "\n",
+    "These data are described by the following publications:\n",
+    ">Dieter, C.A., Maupin, M.A., Caldwell, R.R., Harris, M.A., Ivahnenko, T.I., Lovelace, J.K., Barber, N.L., Linsey, K.S., 2018. Estimated use of water in the United States in 2015 (USGS Numbered Series No. 1441), Circular. U.S. Geological Survey, Reston, VA.\n",
+    "\n",
+    ">Maupin, M.A., Kenny, J.F., Hutson, S.S., Lovelace, J.K., Barber, N.L., Linsey, K.S., 2014. Estimated use of water in the United States in 2010, Circular. U.S. Geological Survey, Reston, Virginia."
    ]
   },
   {

USGS_WaterUseStatistics_Summary_CONUS_humanUses.md

@@ -40,6 +40,11 @@ Sources:
 https://water.usgs.gov/watuse/data/
 USGS data is in the Public Domain.
 
+These data are described by the following publications:
+>Dieter, C.A., Maupin, M.A., Caldwell, R.R., Harris, M.A., Ivahnenko, T.I., Lovelace, J.K., Barber, N.L., Linsey, K.S., 2018. Estimated use of water in the United States in 2015 (USGS Numbered Series No. 1441), Circular. U.S. Geological Survey, Reston, VA.
+
+>Maupin, M.A., Kenny, J.F., Hutson, S.S., Lovelace, J.K., Barber, N.L., Linsey, K.S., 2014. Estimated use of water in the United States in 2010, Circular. U.S. Geological Survey, Reston, Virginia.
+
 The author provides no warranty regarding the veracity of the underlying data provided to or summarized by the USGS, and is in no way affiliated with the USGS. 
 
 

readme

@@ -25,4 +25,8 @@ Notes:
 [1] - Assumes that county-wide total Domestic PublicSupply is properly captured by the Population served in the year 2000, and a per-capita PublicSupply rate estimated by the average of such available data from years 1995 and 2005.
 [2] - The commercial classification stopped in 2000.  Assumes that commercial is best suited to be considered industrial supply.  By grouping the uses such, some counties show non-smooth trends in both Domestic and Industrial water uses suggesting that this assumption is not uniformly valid in all counties.
 
+Citations:
 
+Dieter, C.A., Maupin, M.A., Caldwell, R.R., Harris, M.A., Ivahnenko, T.I., Lovelace, J.K., Barber, N.L., Linsey, K.S., 2018. Estimated use of water in the United States in 2015 (USGS Numbered Series No. 1441), Circular. U.S. Geological Survey, Reston, VA.
+
+Maupin, M.A., Kenny, J.F., Hutson, S.S., Lovelace, J.K., Barber, N.L., Linsey, K.S., 2014. Estimated use of water in the United States in 2010, Circular. U.S. Geological Survey, Reston, Virginia.