Comprises: Letters from W.B. Alexander to H.G. Alexander, 1931-1937 Letters from W.B. Alexander to H.G. Alexander, 1938-1944 Letters to H.G. Alexander mostly regarding his booklet on Asian leaf warblers, drafts of the booklet and other notes on leaf warblers, 1969-1971. Also includes a letter to H.G. Alexander from [R.S.R. Fitter], 1984.