Online Books on the Holy Spirit

I don't necessarily agree with the theology in each book. The following are just some online books on the topic of the Holy Spirit. Some of the authors are especially noteworthy like Gordon, Simpson, Murray, Torrey.

The Baptism with the Holy Spirit by R.A. Torrey (here)

 The Person and Work of The Holy Spirit by R.A. Torrey

 The Person and Work of the Holy Spirit by J.C. Ryle

 'The Holy Spirit' or 'Power from on High' VOLUME 1 by A.B. Simpson
 'The Holy Spirit' or 'Power from on High' VOLUME 2 by A.B. Simpson

Walking in the Spirit by A.B. Simpson (or here)

The Spirit of Christ by Andrew Murray

The Ministry of the Spirit by A.J. Gordon (here, here, here)

The Spirit of God by G. Campbell Morgan

Paul, the Spirit and the People of God by Gordon Fee

Gospel and Spirit Issues in New Testament Hermeneutics by Gordon Fee

The Holy Spirit in the New Testament by Arno Clemens Gaebelein

The Offices of the Holy Spirit by Dougan Clark

Office Work of the Holy Spirit by Henry Albert Erdmann

The Person and Work of the Holy Spirit by Samuel Ridout

The Holy Spirit And You by Frau Dr. Gertrud Wasserzug