Linky
They say...
"Search millions of photographs from the LIFE photo archive, stretching from the 1750s to today. Most were never published and are now available for the first time through the joint work of LIFE and Google"
About 20% online so far.
The 1930s ones of poverty in the USA are harrowing
<pedant>Photographs from the 1750s before photography was invented will interesting
</pedant>