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