21
Weird Astronomy [E-Book] : Tales of Unusual, Bizarre, and Other Hard to Explain Observations /
22
Atlas of Astronomical Discoveries [E-Book] /
23
Astronomical Spectroscopy for Amateurs [E-Book] /
24
Patrick Moore's data book of astronomy / [E-Book]
25
A Spectroscopic Atlas of Bright Stars [E-Book] : A Pocket Field Guide /
26
Turning Dust to Gold [E-Book] : Building a Future on the Moon and Mars /
27
Astronomers Anonymous [E-Book] : Getting Help with the Puzzles and Pitfalls of Practical Astronomy /
28
The Making of History's Greatest Star Map [E-Book] /
29
Star Clusters [E-Book] : A Pocket Field Guide /
30
The Moon in Close-up [E-Book] : A Next Generation Astronomer's Guide /
31
Galileo and 400 Years of Telescopic Astronomy [E-Book] /
32
Moonwalk with Your Eyes [E-Book] : A Pocket Field Guide /
...Astronomer’s Pocket Field Guide...

Full text 
33
Comets and How to Observe Them [E-Book] /
...Astronomers' Observing Guides,...

Full text 
34
A Visual Astronomer's Photographic Guide to the Deep Sky [E-Book] : A Pocket Field Guide /
35
E.T. Talk [E-Book] : How Will We Communicate with Intelligent Life on Other Worlds? /
36
Astronomical Optics and Elasticity Theory [E-Book] : Active Optics Methods /
37
Cataclysmic Cosmic Events and How to Observe Them [E-Book] /
38
Radio Recombination Lines [E-Book] : Their Physics and Astronomical Applications /
39
The Principles of Astronomical Telescope Design [E-Book] /
40
Lunar Meteoroid Impacts and How to Observe Them [E-Book] /