10.17028/rd.lboro.7952456.v1 Ken Chatterton Ken Chatterton Plastic slab Loughborough University 2019 WEDC Latrines Latrines slabs Latrine seats Technical Diagram International and Development Communication 2019-05-02 11:51:31 Figure https://repository.lboro.ac.uk/articles/figure/Plastic_slab/7952456 Plastic slab