A reader sends:
A link to all of the Doctors Without Borders guidelines. These cover everything from OB to public health engineering (the latter being critical) They assume primitive conditions and limited supplies. All are free for download.
I think I have sent you at least the public engineering before, I believe this is a new edition but am not 100% sure.
Save in both soft and hardcopy formats.
UPDATE 1030E 02NOV2019: Another reader suggests this link as an alienate for the MSF materials: