Law-Serious Call to a Devout and Holy Life is a long 27 chapter work on how to be holy. Excellent work! Classic. Must read book.
Winslow The Ministry of the Home is a single chapter work by Winslow on our lot of suffering as Christians.
Aitken Doctrine of Baptism is a 8 chapter work on baptism, looking at it from the consideration of Regeneration and Conversion.
Bragg Angelology Systematic Theology by E.C. Bragg (Trinity College) is a set of classes notes apparently on angels. He is brief but has good material.
Winslow Experimental and Practical Views of the Atonement analyzes the different aspects of the Atonement.
This work by Nazarene author Arthur Vess explores the topic of evangelizing our loved ones, focusing on breaking the repetition of unsaved people having unsaved children.