Definitive Determination of the Orbit of Comet 1898 IHeber Doust Curtis · First published 2018Open the Tome
The Scale of the Universe, Issue 11Harlow Shapley, Heber Doust Curtis · First published 2018Open the Tome
One scientist's religionHeber Doust Curtis, Will Carl Rufus, University of Michigan. Wesley Foundation · First published 1944Open the Tome
Studies of the NebulaeLick Observatory, Heber Doust Curtis, William Wallace Campbell · First published 1918Open the Tome
