This text was made by Jan during his later years in Ghana (1986-1987). At the time much of the work was related to the maintaintence of Diesel power plants of the hospitals that HES was serving. The engines were mostly Lister Diesels. The models described in this book are similar to the HA and HR type of Lister Diesels. They were most commonly in use in our hospitals.
The book was fully written with his newly acquired (1984) Apple //c computer, using Apple Works for wordprocessing and MousePaint for making the drawings. Printing was done on a stencil by the Apple Imagewriter. These stencils were then used for duplicating. It resulted in a for that time amazing quality of the document!