| Author: | Bell, Clive; | Collection Title: | Policy Research working paper
; no. WPS 6168 |
| Document Date: | 2012/08/01 | Document Type: | Policy Research Working Paper |
| Report Number: | WPS6168 | SubTopics: | Environmental Economics & Policies; Rural Roads & Transport; Transport Economics Policy & Planning; Economic Theory & Research; Health Monitoring & Evaluation |