- 1Archival material relating to the firm of H.N. Irving & Son, instrument makers (IRV)
c. 1950 – 2005, fonds - 2Business correspondence and invoices (IRV/A)
c. 1950 – 2005, series - 3Documents relating to hypsometer “test baths” (IRV/B)
c. 1950 – 2005, series - 4Order books and cash books (IRV/C)
c. 1950 – 2005, series - 5Design drawings (IRV/D)
c. 1950 – 2005, series - 6Photographs (IRV/E)
c. 1950 – 2005, series - 7Promotional literature (IRV/F)
c. 1950 – 2005, series - 8Certificates (IRV/G)
c. 1950 – 2005, series - 9H.N. Irving & Son promotional literature (IRV/F/1)
c. 1950 – 2005, series - 10Promotional literature of other manufacturers (IRV/F/2)
c. 1950 – 2005, series - 11Ephemera (IRV/J)
c. 1950 – 2005, series
