You've heard of Currier and Ives in the popular Christmas song "Sleigh Ride" about how "It'll nearly be like a picture print by Currier and Ives. These wonderful things are the things we remember all through our lives."
Nathanial Currier and James Merritt Ives were American printmakers from 1834-1895 who were self described as "Publishers of Cheap and Popular Prints." The firm generated black and white lithographs which were then hand colored. They made 2-3 new images each week for 64 years! There's at least 7500 unique prints that are known!