I found today

This page seems important in establishing a date, and relationships between M, M2, Gothic Book, and the Sheets:

• Notebook M p.100, already written at the time of Notebook M2 p.44, is associated with Sheet No. 76 [n/a].
• Notebook M p.119 is dated 30th December.
• Notebook M2 p.44 is dated 17th January.

Notebook M p.130 is linked with Sheet Nos. 112 and 113 [n/a] (both presumably before Sheet No. 113b [n/a], and both concerned with the Ducal Palace). Notebook M p.130 includes a work plan for three days, including SS Giovanni e Paolo and the Ducal Palace. Gothic Book p.26L marks a shift from SS Giovanni e Paolo to the Upper arcade of the Ducal Palace, the notes apparently made on 17th January.

It is speculative, but seems not unreasonable, to link Notebook M2 pp.44ff and Gothic Book pp.26Lff with the work plan set out at Notebook M p.130.

Notebook M p.161 is dated 31st January.

[Version 0.05: May 2008]