- Human ecology--Congresses (9)
- Environmental policy--Congresses (2)
- Environmental protection--Congresses (2)
- Cities and towns--Congresses (1)
- City planning--Congresses (1)
- Conservation of natural resources--Congresses (1)
- Ecology--Congresses (1)
- Human reproduction--Congresses (1)
- Planning--Congresses (1)
- Technology--Social aspects--Congresses (1)