The UC San Diego Library Digital Collections (DC) is a curated repository for sharing and preserving research data as well as cultural heritage materials. Digital Object Identifiers (DOIs) are provided for all research datasets, so the data can be cited easily and accessed persistently. The contents of the DC are replicated in Chronopolis, a certified, geographically distributed preservation system designed to prevent catastrophic loss of data. Most research datasets are openly accessible, although submissions are restricted to University affiliates.