Leaflet map with multiple API data feeds from USGS, Socrata, Esri ArcGIS Online
https://datavizforall.github.io/leaflet-data-apis/index.html
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Data Visualization for All book, tutorials in-progress on Leaflet code templates http://DataVizForAll.org
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Socrata requires developers to register for a free app token at https://dev.socrata.com/register
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Tim Stallmann, Mapping external GeoJSON data, http://savaslabs.com/2015/05/18/mapping-geojson.html