Elevation. Earth topography grid at 10 arc-minutes, version 1, by Fatiando a Terra (source (opens in a new tab)), derived from NOAA ETOPO1 (original data (opens in a new tab), public domain). Licensed under CC BY 4.0 (opens in a new tab). Changed for this map: reprojected, resampled, smoothed and toned, and combined with the relief shading below.
Relief shading. From basemap-data 2.0.0 (matplotlib basemap), originally from shadedrelief.com. Changed for this map: reprojected, reduced to its shading and toned. Copyright (c) 2011 Jeffrey Whitaker, used under the MIT License (opens in a new tab):
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Outlines and office positions. US Census Bureau: cartographic boundary files (2017, via us-atlas) and the Census Geocoder. Public domain.