I've linked to Lewis Hines before, but it's always worth repeating when someone reminds me of it again.

Lewis Wickes Hine's "Work Portraits"

thanks to plep

Pencils of Light
The Albums of the Edinburgh Calotype Club

These two albums of the Edinburgh Calotype Club, the first photographic club in the world, are among the earliest photograph albums in the world ever assembled. They contain over 300 images by a group of pioneering Scottish photographers working in Edinburgh and St. Andrews....

thanks to wood s lot