Latest issue ( no. 15 -2015 ) : http://www.iucn-isg.org/wp-content/uploads/2016/10/ISG_Newsletter_15_sm.pdf
Latest issue ( vol 16 - 2016 ) : http://www.iucn-isg.org/wp-content/uploads/2017/12/ISG_Newsletter_16.pdf
A little late but still intresting, the latest isue I was able to find : https://www.iucn-isg.org/wp-content/uploads/2020/01/ISG_Newsletter_18.pdf