I know that you don't put a blank line under the centered volume number in transcriber's notes for the table of contents but what if it is followed by a cell 5 heading? Do you keep a blank line or not?
Do you include the title of the book as a centered heading in the table of contents?
The volume identifiers specifically state that a blank line does not follow them. Examples in formats show centered headings immediately follow the volume identifier. I believe you can interpret the same logic to a cell 5 heading - so no blank line between a volume identifier and cell 5 heading.
As info - I would probably put the months in this contents in cell 1 and the information under them in cell 3 with runovers in cell 5 - it saves some space and still conveys the same message.