Rounded up some warblers during my lunch hour, along the Patuxent Branch 
Trail in Columbia.

Acadian Flycatcher
Great Crested Flycatcher
White-eyed Vireo - 3
Red-eyed Vireo - 3
Wood Thrush - 5
Blue-winged Warbler - 2
Northern Parula - 4
Magnolia Warbler
Black-throated Blue Warbler - 2
Yellow-rumped Warbler - 6
Black-throated Green Warbler
Blackpoll Warbler
Black-and-white Warbler - 2
Ovenbird
Louisiana Waterthrush
Common Yellowthroat
Scarlet Tanager
Rose-breasted Grosbeak

-Steve Collins
Towson, MD
http://odephoto.com