I enjoy a PDF of Serviss Opera Glass but my only good old handbook is the
New Handbook of the Heavens (1941, 1948) Bernhard Bennett and Rice.
It is an old school all-in-one astronomy guide, covering constellations, zodiacal light, the moon and solar system, double and variable stars, deep sky, telescope use, concepts of navigation, and astronomy for the traveler and more in 21 chapters about 15-pages each, with a stack of appendices.
The constellation guide and small seasonal maps have a few enjoyable aside about varied mythology and visual description of constellations. Glancing before this post made me agree that Capricornus does look more like a butterfly than a goat or sea-goat, and read that while it was a goat to ancient Babylonians it was a narwhal to Mesoamericans, an ox to Chinese and an antelope to ancient Indians. Now I need to read "Listen, the Wind" to see how many times Ann Morrow Lindbergh called out Alpheratz, shared by Andromeda and the square of Pegasus.
There are larger maps with brightest deep sky objects and a basic eyeball to binocular scale moon map. While the deep sky objects are not that deep, the illustrations are a few Harvard plates (recalling Glass Universe). The extensive meteor shower list is probably half the reason I pull it off the shelf lately.