A unique manuscript - a handwritten column-scroll over 300m in length - was treated at the Preservation Laboratory of the Russian Academy of Science Archive. Thorough conservation treatment of "Cathedral Code of 1649" has allowed the scientists to carry out the codicological research. While unrolling the manuscript many important details about the scripting process, editing, combining the sheets in the scroll were discovered. A challenging decision, about rearranging the sheet sequence based on the scientific research, is described in this paper. Now the whole information about research and conservation treatment, and a digital copy of the Cathedral Code as well, are available for public access via the internet.

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