SAM.gov

SAM.gov - official U.S. government website which provides data and resources for federal contracts and grant awards. SAM.gov requires the users to create an account to access additional functionality (save searches, follow records and workplace) beyond the basic public search. 

All entities receiving grants from the federal government must be registered with SAM.gov.  If you will be working with entities who have not received federal grants before, particularly those overseas, you should check their SAM registration to make sure they're eligible to receive awards.

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