Source
Pollard, Notes on the Size... (1941)
Graham Pollard (1941), “Notes on the Size of the Sheet”, The Library, 4th series, vol. 22 (2, 3), pp. 105–137.
Additional Reference
p. 112
Graham Pollard (1941), “Notes on the Size of the Sheet”, The Library, 4th series, vol. 22 (2, 3), pp. 105–137.
p. 112