Update: the free pdf has been claimed (I received three emails -- and no comnents, in total).
Sola Scripture is published by Reformation Heritage Books and the contributing authors are:
Dr. W. Robert Godfrey is president of Westminster Seminary California in Escondido, California, and professor of church history there.
Dr. James White is the director of Alpha & Omega Ministries, a Christian apologetics organization based in Phoenix, Arizona. He is a professor, having taught Greek, systematic theology, and various topics in the field of apologetics.
Dr. R. C. Sproul is founder, chairman, and president of Ligonier Ministries of Lake Mary, Florida, and minister of preaching and teaching at Saint Andrew’s in Sanford, Florida.
Dr. Derek W. H. Thomas, a native of Wales, is a professor of systematic and practical theology at Reformed Theological Seminary in Jackson, Mississippi, and minister of teaching at First Presbyterian Church in Jackson.
Dr. John MacArthur is pastor/teacher at Grace Community Church in Sun Valley, California. Dr. MacArthur also serves as president of the Master’s College and Seminary in Southern California.
Dr. Sinclair B. Ferguson is senior minister of First Presbyterian Church in Columbia, South Carolina, and professor of systematic theology at Redeemer Theological Seminary in Dallas, Texas.
Dr. Joel R. Beeke is a pastor of the Heritage Netherlands Reformed Congregation; president of and professor of systematic theology at Puritan Reformed Theological Seminary; editor of the Banner of Sovereign Grace Truth magazine; editorial director for Reformation Heritage Books; president of Inheritance Publishers; and vice president of the Dutch Reformed Translation Society, all in Grand Rapids, Michigan.
Rev. Ray B. Lanning is pastor of the First Reformed Presbyterian Church in Grand Rapids, Michigan. Ordained to the ministry in 1977, he has served Presbyterian and Reformed churches in various parts of the United States and Canada.