| RefNo | Title | Date |
| L/E/75/28 | Industrial Rhythm \ Hijmans' Report \ Costing with the Aid of Parameters | 15 February 1946 |
| L/E/75/24 | Industrial Rhythm \ Hijmans' Report \ Letter from E. Hijmans to F.C. Lawrence | 27 April 1940-20 June 1944 |
| L/E/75/25 | Industrial Rhythm \ E. Hijmans' Report \ Short Summary of Hijman's Report | 8 April 1946 |