Many of the referenced works in Dabney's Systematic are in Logos format but are not indexed and linked. Tuuretin's Instutues, Kant's works, John Dick's Lectures on Theology, Thomas Ridgley's Body of Divinity, Thornwell's Works, John Howe's The Living Temple, John Locke's Essay on Human Understanding, Xenophon, Cicero, works of Benjamin Breckinridge, Stephen Charnock's Discourse on the Attributes of God, Aquinas' Summa and so forth.
I hope that someone has noticed this and looks to correct it.