Copy letter from Robert William Frederick Harrison to Messrs Harrison & Sons 'Please supply Mr Edward Arnold (at his cost) with electros of the following blocks illustrating papers by Professor Swale Vincent:- Proc[eedings of the Royal Society] B 82 Fig. 12 p.513. Proc. Vol. 61 Figs. 1 & 2. pp.67 & 68.' 19 February 1912