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Dataset Search Engines
The U.S. government is one of the biggest publishers of data in the world. This site searches their datasets.
"The home of the U.S. Government’s open data
Here you will find data, tools, and resources to conduct research, develop web and mobile applications, design data visualizations, and more."
"Data Observation Network for Earth (DataONE) is a community driven project providing access to data across multiple member repositories, supporting enhanced search and discovery of Earth and environmental data. DataONE promotes best practices in data management through responsive educational resources and materials."
Google Dataset Search
This search engine is in beta testing, but it is from Google and works well.
"Dataset Search enables users to find datasets stored across the Web through a simple keyword search. The tool surfaces information about datasets hosted in thousands of repositories across the Web, making these datasets universally accessible and useful."
Registry of Research Data Repositories - re3data.org
re3data.org searches data repositories in the U.S. and Europe.
"re3data.org is a global registry of research data repositories that covers research data repositories from different academic disciplines. It presents repositories for the permanent storage and access of data sets to researchers, funding bodies, publishers and scholarly institutions. re3data.org promotes a culture of sharing, increased access and better visibility of research data."