Living the Purpose Inspired LIfeRoberts Perry, Paul Markel, Patrick Usifo · First published 2018Open the Tome
Student of the Gun; A beginner once, a student for LifePaul G. Markel · First published 2011Open the Tome
The transposition of esters and the interdependence of limitsPaul David Markel · First published 1916Open the Tome
