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iNaturalist has worldwide observations of biological organisms. You can do a bulk download here. This data is not strictly "open", because login is required. However it is free to register. Use this query to download observations of Suborder Anisoptera (Dragonflies): quality_grade=any&identifications=any&taxon_id=47927 There are currently 357100 ...


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Railroads and the Making of Modern America has links to the following downloadable historical US railroad data. I didn't investigate the actual geospatial extent of these railroad datasets, so I can't promise they have Colorado railroads. Here's a wayback machine link in case the original site goes down. Download Data Historical GIS: Depots of the ...


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You can Find the information city wise here: http://us-city.census.okfn.org/dataset/zoning This is free data and can be downloaded in bulk as well. One of the sample of zoning is as provided here If you have a budget as well then you can get the complete data on arcgis. Sample of the same in action can be viewed here Bonus: You can have other detailed ...


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Inland bathymetry data for South Africa is not easy to locate. I found some sources that seem promising. I don't have time right now to fully dig through each of these sources to see if they have exactly the right thing, so here's a link dump of all the relevant-sounding data sources I found. If you do find exactly what you want at one of these links, please ...


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You must start from here, from NASA site: https://earthdata.nasa.gov/learn/sensing-our-planet/matter-in-motion-earth-s-changing-gravity#ed-sop-datatable


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