1. LKB1 Reference (shelfmark): LKB1 Title: Correspondence from family and friends Scope & Content: Correspondence from family and friends including letters and cards, and some brochures Collection Area: Sound Archive Languages: English and German Date Range: Mid 20th century Extent: 67 folios and 18 items
2. LKB1.3 Reference (shelfmark): LKB1.3 Title: Brochures Scope & Content: RSPB dinner programme, Malta Ornithological Society report, Guide to American Museum in Bath. Undated document(s) Collection Area: Sound Archive Languages: English Date Range: Mid 20th century Extent: 3 items
3. LKB1.1 Reference (shelfmark): LKB1.1 Title: Correspondence from family members Scope & Content: Correspondence, letters and postcards from friends, family and colleagues [some German] Collection Area: Sound Archive Languages: English and German Date Range: 1945-1967 Extent: 67 folios
4. LKB1.2 Reference (shelfmark): LKB1.2 Title: Cards from family members and friends Scope & Content: Birthday and Christmas cards from friends and family, many homemade including photos of Koch stuck onto other pictures Collection Area: Sound Archive Languages: English Date Range: 1960-1970 Extent: 15 items