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| Desertification Map of the World (联合国粮农组织、联合国教科文组织和世界气象组织为1977年联合国荒漠化会议编制，比例尺为1 ： 2500万) | |||
| 《世界荒漠化图》: 2 phrases in 1 subject |
| Desert science | 2 |
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