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## By Year

Technical Memos        April 7, 1997        TM97-04 Tritium/helium dating of ground-water samples available through contract with Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York

Science Snippet        October 21, 2016        EarthView–Beauty of Earth Science Revealed Within Great Smoky Mountains

Science Snippet        November 17, 2023        Why we have better maps of Mars than of the seafloor—and what USGS is doing to change that

Science Snippet        June 11, 2016        EarthWord–Scour

Science Snippet        February 23, 2023        Volcanic explosion penetrates both upper atmosphere and upper crust around the globe

Science Snippet        April 25, 2017        EarthWord–Placer

Science Snippet        April 13, 2017        Up in the Air to Look Deep Underground

Science Snippet        October 19, 2018        Celebrating Geologic Map Day 2018

Science Snippet        September 28, 2017        “Geologic Open House” at Great Falls Park Announced

Technical Memos        July 20, 2021        NMFS Biological Opinion

Technical Memos        July 20, 2021        NMFS Incidental Harassment Authorization

Technical Memos        October 8, 1998        TM99-01 Change in reporting unit for relative abundances of helium isotopes

Technical Memos        July 20, 2021        USFWS Incidental Harassment Authorization

Science Snippet        November 20, 2017        Satellite Imagery Aids Rescue Efforts for Hurricanes Harvey, Irma and Maria

Technical Memos        December 13, 2018        NCCWSC 2009 National Workshop Summary

Technical Memos        July 20, 2021        Final Environmental Assessment

Technical Memos        April 7, 1997        TM97-04S Collection, processing, and analysis of ground-water samples for tritium/helium-3 dating;