Notebook 1 = N V 1. Beginning of 1880
Notebook 2 = N V 2. Spring 1880
Notebook 3 = M II 1. Spring 1880
Notebook 4 = N V 3. Summer 1880
Notebook 5 = Mp XV 1a. Summer 1880
Notebook 6 = N V 4. Autumn 1880
Notebook 7 = N V 6. End of 1880
Notebook 8 = N V 5. Winter 1880–1881
Notebook 9 = M II 2. Winter 1880–1881
Notebook 10 = Mp XV 1b. Spring 1880–Spring