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Related research guides at UMass
Open Access to Federally Funded Research
The Office of Science & Technology Policy says publicly-funded research shall be made available to the public.
So, for research funded by a federal grant, both the publications and data generated by those grants will be "open access".
This is policy is developing. Researchers have time to learn what is required when applying for grants or for papers and data created through them.
See also, the Libraries' Scholarly Communications group.