Land improvement

灌溉對環境的影響（英语：Environmental impact of irrigation） 土地開發（英语：Land improvement） 填海造陸 永續農業 土地退化經濟學倡議（英语：Economics of Land Degradation Initiative） 沙漠化 人口成長（英语：Population

Applications, Publ. 16, pp. 175-224, International Institute for Land Reclamation and Improvement (ILRI), Wageningen, The Netherlands. ISBN 90-70754-33-9 . Free

Search Engine Land. 2016-09-23 [2017-04-20]. （原始内容存档于2022-09-04） （美国英语）.  Penguin 4.0: Necessary and positive improvement. Search Engine Land. 2016-10-25

In: Annual Report 1988 of the International Institute for Land Reclamation and Improvement (ILRI), Wageningen, The Netherlands: 18–34, 1989 [2018-07-20]

[2018-01-14]. （原始内容存档于2018-01-06）.  The New Hwasong-15 ICBM: A Significant Improvement That May be Ready as Early as 2018. 38 North: Informed Analysis of North