Correspondence CORRESPONDENCE, H.1-H.359, divided into 6 sub-series These sections have been retained as originally arranged by Katz, with some amendments to create fully alphabetical and chronological sequences. H.1-H.153A Research students and visiting workers H.154-H.258 Colleagues and organisations H.259-H.298 Personal H.299-H.331 General H.332-H.344 Scientific and technical H.345-H.359 References and requests 1950-2003