Bird Field Guides
There are so many excellent bird field guides out there that I will show only the two I use most frequently in the field.
|Sibley Field Guide to Birds of Eastern North America|
|National Geographic Field Guide to Birds of North America|
And the best bird guide for central Maryland specifically is
|Birding Howard County, Maryland, online edition|
|This guide is in its 2nd edition and is available online only. It is well worth visiting - it contains species accounts, checklists, photos, and detailed descriptions of local birding locations.|