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Best and most useful two documents I have used are "FIELD ENGINEERING - An introduction to development work and construction in rural areas" compiled and edited by Peter Stern and others ... published by Intermediate Technology Publications (now called ITDG Publishing https://itdgpublishing.org.uk/ ), whole section on bridges and very practical. never ravel without that book. Another seminal work is Indian Practical Engineer's Hand Bool .... you will find in almost any developing country in the world to buy or borrow ... I have bought copies in Islamabad (Rp 255), and in Kabul. Has a section on foot bridges. Again would not travel without it, and frequently gift it t one of my local engineers at end of assignment.

As we are RedR forum lets not forget the obvious ... the RedR manual "Engineering in Emergencies" by Jan Davis and Bobby Lambert (available also on CD) which has a section on Small Emergency Timber bridges.

Much more comprehensive and detailed, including design charts, detail drawings, but very useful (though generally for vehicular bridges, it has a section on emergency bridges) is the UK Government Transport Research Laboratory document - Overseas Road Note 9 "A Design manual for Small Bridges", which was funded by DFID... possibly more than you need, but available free on the internet as a UK aid publication ... I always have a soft copy on my computer and it has been invaluable. [Any problems c.nixon@online.com.kh]