There are over 17,000 stellar objects and over 3,000 non-stellar objects plotted in this series alone. Series C uses 94 charts to cover the sky, with a scale of 10mm per degree. Series D , Series E and Series F give expanded views of selected areas of the sky that were too crowded in each prior series. While stellar magnifications vary, non-stellar objects are plotted to Mag 15. The strength of these charts is not simply the volume of objects plotted, but the use of innovative symbols.
Galaxies show position angle, morphology and size.
Planetary nebulae indicate relative brightness of the central star, brightness of halo and more. You also get an idea of an object's relative brightness from its line thickness. There is MUCH more information provided, but this should give you an idea of what these charts have to offer. Even if you depend on digital setting circles with their great catalogs of objects, going from point to point you'll often miss out on nearby objects simply because you didn't know they were there. With the larger scopes of today, good charts are more necessary than ever.