| 1 | https://www.usgs.gov/labs/hydrologic-instrumentation-facility |
| 2 | USGS(1989) "Emudo, New Mexico, Birthplace of Systematic Stream Gaging" Geological Survey Professional Paper 778 |
| 3 | USGS(2015) "Hydraulic Laboratory Testing of SonTek-IQ Plus" USGS Open-File Report 2015-1139 |
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