Comprises: Papers and correspondence relating to the British Birds' Rarities Committee (originally called the Rarity Records Committee), 1957-1965 Folder of correspondence and papers. Includes: Letter from H.G. Alexander to Christopher M. Perrins regarding maps of territorial migrants, 4 Sep 1973; Typescript by H.G. Alexander entitled 'Some memories of the B.O.C. [British Ornithologists'…