Shaw, Rod Handpump and apron 5 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_5/7049204
10.17028/rd.lboro.7049204.v1