Shaw, Rod Handpump and apron 4 Handpump and apron WEDC;Technical;Computer graphics;Black and white;Apron slabs;Handpumps;International and Development Communication 2018-09-10
    https://repository.lboro.ac.uk/articles/figure/Handpump_and_apron_4/7049201
10.17028/rd.lboro.7049201.v1