- Forum Auctions (auction)
- Natural History Museum, London: NHM WP1/8/265
- British Library, The: BL Add. 46437 f. 4
ARW will be glad to see Mr Ridley; mentions CR's trip to S W Ireland; Mr Mitten was at Brandon Mountain a few years ago and found most of the rare mosses, but flowering plants were very scarce. Thanks CR for the I. Naturalist, CR's notes on the Megaceros is interesting, also American sponges.