Promoting farmer innovation : harnessing local environmental knowledge in East Africa / ed. by Will Critchley ... [et al. ; photogr.: Will Critchley ... et al. ; ill. by: Alex Oduor ... et al.]Traditions and innovation in land husbandry : building on local knowledge in Kabale, Uganda / Will Critchley ... [et al. ; photogr. by: Will Critchley ... et al. ; ill. by: Alex Oduor ; ed. by: Will Critchley]Where the land is greener : case studies and analysis of soil and water conservation initiatives worldwide / ed.: Hanspeter Liniger and William Critchley ; associate ed.: Mats Gurtner ... [et al.] ; WOCAT, World Overview of Conservation Approaches and TechnologiesWhere the land is greener : case studies and analysis of soil and water conservation initiatives worldwide / ed.: Hanspeter Liniger and William Critchley ; associate ed.: Mats Gurtner ... [et al.] ; WOCAT, World Overview of Conservation Approaches and Technologies