Agriculture and the sanitary engineer; fertility from sewage.
D000383:Agriculture; D005298:Fertility; D006801:Humans; D006920:Hygiene; D007221:Industry; D009784:Occupational Diseases; D009790:Occupations; D012499:Sanitation; D012722:Sewage
D012722:Sewage
HYGIENE AND SANITATION; INDUSTRY AND OCCUPATIONS/hygiene; SEWAGE/disposal and purification