Purchase Historical Eswatini Topographic Maps

Please help me raise £450 to purchase the historical topographic map series of Eswatini (formerly Swaziland).

During the 1970s the Directorate of Overseas Surveys (DOS) comprehensively mapped Swaziland and produced a series of 1:50000 Topographic Map sheets of the country.

The 31 sheets are now rare and it is very difficult to find a complete set. I have been able to source most of the sheets, but need some help to purchase the last few missing sheets from a commercial archive.

Please help me raise the £450 to purchase these sheets and so that I can put them online like I have done with the South West Africa 50k topographic series.