Observing the Caldwell Objects

Microscope Teachings, Descriptions Of Objects Adapted For Observation

Observational Sketching: Hone Your Artistic Skills by Learning How to Observe and Sketch Everyday Objects

Observing the Messier Objects with a Small Telescope: In the Footsteps of a Great Observer (The Patrick Moore Practical Astronomy Series)

Isolated Objects in Quadratic Gravity: From Action Principles to Observations (Springer Theses)