Diatom Research and Consulting data on sub-Saharan African DEs. Originals with Zlatko Korunic, Diatom ResearchandConsulting, Canada, zkorunic@rogers.com. Electronic copies with: Zlatko Korunic; Tanya Stathers, NRI, UK; William Riwa, MAFS, Tanzania; and Brighton Mvumi, UZ, Zimbabwe. Photographic collections fr