The references at Notebook M2 p.75 are to Door Book pp.51L and 51. Door Book pp.51L and 51 are exactly as described by Ruskin at Notebook M2 p.75, and numbered ‘51’ in Door Book. There is no sign of a page called Door Book p.50, and no evidence that such a page ever existed.
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[Version 0.05: May 2008]