- Automatic theorem proving--Congresses (1)
- Climatic changes--Congresses (1)
- Climatology--Mathematical models--Congresses (1)
- Desert soils--Europe--Congresses (1)
- Desertification--Europe--Congresses (1)
- Electrochemistry--Congresses (1)
- Electronic digital computers--Programming--Congresses (1)
- Environmental policy--European Economic Community countries--Cost effectiveness (1)
- Europe--Climate--Congresses (1)
- Heavy metals--Environmental aspects--Congresses (1)
- Heavy metals--Toxicology--Congresses (1)
- Law--European Economic Community countries (1)
- Logic, Symbolic and mathematical--Congresses (1)
- Office management (1)
- Office practice--Automation (1)
- Paleoclimatology--Europe--Congresses (1)
- Photobiology--Congresses (1)
- Photochemistry--Congresses (1)
- Photoelectricity--Congresses (1)
- Solar energy--Congresses (1)
- Trace elements--Environmental aspects--Congresses (1)
- Trace elements--Toxicology--Congresses (1)
- ヨーロッパ--農業 (1)
- 欧州統合 (1)
- 牛の病気と手当 (1)
- 農業地質学．土壌侵食 (1)