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Access Supplemental Data
Our API allows users to download NHGIS Supplemental Data without needing to visit an IPUMS website.
If, on a webpage, the URL to download a file begins with https://secure-assets.ipums.org/ and the collection allows downloading supplemental data through the API, then the API URL to download that file can be found by replacing https://secure-assets.ipums.org/ with https://api.ipums.org/supplemental-data/.
See example code showing how to use the API to download IPUMS NHGIS supplemental data.