- 1Research Material relating to Dairy Heat Pumps (2022-590)
1928-2020, fonds - 2Reports of the Electrical Research Association Agricultural Sub-Committee and others (2022-590/2)
September 1951 - 2020, series - 3Reports by Electrical Research Association Agricultural Sub-Committee (2022-590/2/1)
September 1951 - 2020, file