Mapping intricacies: UDC to DDC

Last week, I received an email from Yulia Skora (Ukraine) who was interested in the availability of the mapping between UDC Summary and the Summary of the Russian universal classification LBC (BBK - Библиотечно-библиографическая классификация in English: Library Bibliographic Classification) Summary. It reminded me of yet another challenging area of work. When responding to Yulia I realised that