I have added to the articles page the following resources that have chapters or divisions on Hebrews:
Adeney, Walter Frederic. “The Theology of the Epistle to the Hebrews.” Pages 218–28 in The Theology of the New Testament. 1894.
Bartlet, James Vernon. “Palestine and the Epistle ‘to Hebrews.’” Pages 277–96 in The Apostolic Age: Its Life, Doctrine, Worship, and Polity. 1900.
Beyschlag, Willibald. “The Epistle to the Hebrews.” Pages 282–347 in New Testament Theology or Historical Account of the Teaching of Jesus and of Primitive Christianity according to the New Testament Sources. Vol. 2. 1895.
Bovon, Jules. “L’épître aux Hébreux.” Pages 357–403 in Théologie du Nouveau Testament. Tome second: L’enseignement des apotres. 2d ed. 1905.
Feine, Paul. “Der Hebräerbrief.” Pages 643–57 in Theologie des Neuen Testaments. Leipzig: Hinrich, 1912.
Gould, Ezra Palmer. “The Epistle to the Hebrews.” Pages 160–73 in The Biblical Theology of the New Testament. 1900.
Holtzmann, Heinrich Julius. "Der Autor ad Hebraeos." Pages 281–308 in Lehrbuch der neutestamenlichen Theologie. Vol. 2. 1897.
Lechler, Gotthard Victor. “The Doctrine of the Epistle to the Hebrews.” Pages 119–35 in The Apostolic and Post-Apostolic Times: Their Diversity and Unity in Life and Doctrine. 3d ed. Vol. 2. Translated by A. J. K. Davidson. 1886.
McGiffert, Arthur Cushman. “The Christianity of the Epistle to the Hebrews.” Pages 463–82 in A History of Christianity in the Apostolic Age. International Theological Library. 1897.
Neander, Augustus. “The Doctrine of the Epistle to the Hebrews.” Pages 212–28 in History of the Planting and Training of the Christian Church by the Apostles. Vol. 2. Edinburgh: Thomas Clark, 1842.
Pfleiderer, Otto. “The Epistle to the Hebrews.” Pages 272–99 in Primitive Christianity: Its Writings and Teachings in Their Historical Connections. Vol. 3. Translated by W. Montgomery. 1910.
Rendall, Frederic. “The Epistle to the Hebrews.” Pages 11–92 in The Theology of the Hebrew Christians. 1886.
Reuss, Edward. “The Epistle to the Hebrews.” Pages 238–61 in History of Christian Theology in the Apostolic Age. Vol. 2. 1874.
Sheldon, Henry C. “Modified Paulinism—Hebrews and First Peter.” Pages 270–99 in New Testament Theology. New York: Macmillan, 1911.
Stevens, George Barker. "The Theology of the Epistle to the Hebrews." Pages 483-522 in The Theology of the New Testament. 1899.
Weiss, Bernhard. “The Epistle to the Hebrews.” Pages 166–234 in Biblical Theology of the New Testament. Vol. 2. 1883.