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## By Year

map        January 1, 1993        The magnetic field of the Earth, 1990: Declination chart

map        January 1, 1988        The magnetic field of the earth— 1985: Declination chart

map        January 1, 1983        The magnetic field of the earth, 1980 magnetic declination

map        January 1, 1981        Magnetic declination in the United States; epoch 1980

map        January 1, 1975        Magnetic declination in the United States; epoch 1975.0

map        January 1, 1992        The magnetic field in the United States, 1990: Declination chart

map        January 1, 1988        The magnetic field in the United States, 1985: Declination chart

Supporting material        July 13, 2023        Citizen Science Call-to-Action Flyer

map        August 3, 2023        Estimating streambed hydraulic conductivity for selected streams in the Mississippi Alluvial Plain using continuous resistivity profiling methods—Delta region

map        June 15, 2023        Potentiometric surface map of the Southern High Plains aquifer in the Cannon Air Force Base area, Curry County, New Mexico, 2020

map        June 20, 2019        Geostatistical estimation of the bottom altitude and thickness of the Mississippi River Valley alluvial aquifer

map        September 27, 2013        Bathymetry, morphology, and lakebed geologic characteristics of potential Kokanee salmon spawning habitat in Lake Pend Oreille, Bayview and Lakeview quadrangles, Idaho

map        June 21, 2016        Changes between early development (1930–60) and recent (2005–15) groundwater-level altitudes and dissolved-solids and nitrate concentrations In and near Gaines, Terry, and Yoakum Counties, Texas

map        April 14, 2007        The International Geomagnetic Reference Field, 2005

map        July 12, 2011        Estimated 2008 groundwater potentiometric surface and predevelopment to 2008 water-level change in the Santa Fe Group aquifer system in the Albuquerque area, central New Mexico

map        July 16, 2014        Estimated 2012 groundwater potentiometric surface and drawdown from predevelopment to 2012 in the Santa Fe Group aquifer system in the Albuquerque metropolitan area, central New Mexico

map        December 29, 2016        Water-level changes in the High Plains aquifer, Republican River Basin in Colorado, Kansas, and Nebraska, 2002 to 2015

Brochures        October 17, 2019        Powell Center 2019 Seminar: NASA’S GRACE SATELLITE: WHAT IT CAN AND...