The NHS archives contain documentation mostly from the central presidency:
- Correspondence, minutes, membership lists, press cuttings, documents relating to annuals and inventory lists
- Files from the NHS’s foundation period (1911–1920)
- Documents from the years 1916–1984 and 1940–1992 that were acquired in two consignments from the Vadiana library in St. Gallen and the Stapferhaus, Lenzburg Castle
- Documentation collected from the Presidents and Vice-Presidents of the NHS and its regional committees from the years 1993–2000 and 2004–2011