Here are some books you can read online at Google Books:
Martyrs of the Coliseum by Rev. A. J. O’Reilly
The Future Life by Rev. Joseph C. Sasia, S.J.
Mary: The Perfect Woman by Emily Mary Shapcote
Stories of the Saints: Saints of the Early Church by M.F.S.
Life of the Venerable Anna Maria Taigi by R. F. Calixte
Faith of Our Fathers by James Cardinal Gibbons (1905 edition) Also can be downloaded as a PDF.
Theology of the Cultus of the Sacred Heart (dissertation) by Rev. Joseph Petrovits. Also can be downloaded.