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Total
Available to anyone online
Without submitting requests
Without registration
Free of charge
In Bulk/API
Downloadable in bulk
Application Programming Interface (API)
Open license
Open license terms
Explicitness of the license
Machine-readable
Machine-readable formats
Structured or standardized
Open format
(non-proprietary)
(non-proprietary)
Primary
Timely
Metadata
Core metadata
Contextual information
Permanent
Identifier
Human Readable
other public sources
other public sources
other public sources
other public sources
overall