H Orton Wiley’s Christian Theology series is now free on Kindle. It is a three volume systematic theology written from a Holiness/Wesleyan/Arminian perspective. Wiley was an early Nazarene theologian.
Christian Theology: Volume 1
Christian Theology: Volume 2
Christian Theology: Volume 3
The Wesley Center Online also has it available in web format here.
HT: Steve Noel
Thanks for this!