From page 182-183 in The Warbler Guide:
The Blackpoll Warblers (fall birds) have yellowish throat and breast in contrast with the white lower belly. They have bold white wing bars, and distinct eyeline with broken eyering. The Blackpoll Warblers have contrasting tertial edging, and flight feathers white-edged on tips. Their streaking in sides and back is always present even when faint. Their long wings indicate a long-distance migrant: up to 7,000 miles each way—more than any other warbler.
Warblers are among the most challenging birds to identify. They exhibit an array of seasonal plumages and have distinctive yet oft-confused calls and songs. The Warbler Guide enables you to quickly identify any of the 56 species of warblers in the United States and Canada. This groundbreaking guide features more than 1,000 stunning color photos, extensive species accounts with multiple viewing angles, and an entirely new system of vocalization analysis that helps you distinguish songs and calls.
The Warbler Guide revolutionizes birdwatching, making warbler identification easier than ever before. For more information, please see the author videos on the Princeton University Press website.