I do not recommend any hard-bound atlas for field work. Loose charts or spiral bound are best. For example I have SkyAtlas 2000.0 by Wil Tirion and Roger Sinnot. It is spiral bound and lies flat in the field. But...

It is a pain because the charts fold out making it difficult to flip between charts. I also find these atlases better suited to binocular astronomy. Telescopic fields are too narrow and often too detailed to be easily correlated to a chart position. They are good for 'ballpark' finding. For this reason I will use software of my own design for detailed "finding" or verification of observations.

-Veeger