CoCo is a multidisciplinary consortium that integrates letter catalogue metadata from cultural heritage (CH) institutions in Finland into a single reconciled Linked Open Data infrastructure and publishes analysis tools on an open semantic portal, where a researcher can discern at a glance a whole web of connections with their object of study, the available letter collections and their keepers. The project enables us to conduct empirical, bottom-up case studies on
epistolary culture and social networks in the Grand Duchy of Finland (1809–1917), ask ambitious research questions in the field of computer science and make currently scattered, heterogeneous epistolary metadata interoperable and available.

The semantic portal LetterSampo Finland – Kirjesampo was published 27th May 2025.

The consortium is funded by the Academy of Finland (decision numbers 339828, 340834 and 339918), and it will take place in 2021–2025.