Cometography is a multi-volume catalog of every comet observed throughout history. Volume 3 provides a complete discussion of every comet seen during the first part of the twentieth century. Cometography uses the most reliable orbits known to determine the distances from the Earth and Sun at the time a comet was discovered and last observed, as well as the largest and smallest angular distance to the Sun, most northerly and southerly declination, closest distance to the Earth, and other details to enable the reader to understand the physical appearance of each well-observed comet. The book...