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For research-heavy "land" and "number" data, organizations like the U.S. Geological Survey (USGS) provide bulk downloads of observations, which include massive datasets on land cover and elevation. Landsat Data Access | U.S. Geological Survey - USGS.gov

Sites like EduRev offer downloadable PDFs (which can be zipped for storage) that illustrate place values like lakhs and crores.

for a billion) or natural language terms to make them readable.