/packages/system.threading/4.3.0/ref/
../
MonoAndroid10
MonoTouch10
net45
netcore50
netstandard1.0
netstandard1.3
portable-net45+win8+wp8+wpa81
win8
wp80
wpa81
xamarinios10
xamarinmac20
xamarintvos10
xamarinwatchos10