Worth a look
http://comeheretome.com/2013/12/06/even-the-olives-are-bleeding-1976-documentary/

Can anybody remind me?
Many years ago I read a remarkable book of essays by a Canadian doctor (Norman ... ?) in which he described volunteers queuing up to donate blood following the bombing of Madrid
It also includes a chapter on the Chinese Long March.
Can't remember the title but I would love to re-read it.
Jim Carroll