NB 20, spread 1 ... 20 ... Corinth:Notebook:20
ΝΝ-20 ... ΝΝ-20-1 ... ΝΝ-20-1
ΟΟ-20 ... ΟΟ-20-1 ... ΟΟ-20-1
Κ-20 ... Κ-20-1 ... Κ-20-1
1 Pg. 1, 17/6/1903, Drawing ... 17/6/1903 ... NB 20, spread 6 (p. 1) ... 20 ... Corinth:Notebook:20
Ω-1 20, 21 ... 20, 21 ... Ω-1
ΠΠ-1 20, 21 ΠΠ 8 SS 9988 ... May 7 1947 ... 20, 21 ... ΠΠ-1
ΞΞ-1 19, 20 ... 20 Feb 1939 ... ΞΞ-1-14 (pp. 19-20) ... ΞΞ-1-14 ... ΞΞ.20