Automatically extracting text from scans of old newspapers and magazines is extremely challenging. Although the best available Optical Character Recognition (OCR) software has been used, the condition of the images it has to process combined with the frequently small fonts used means that many errors of interpretation are made.
Thankfully, many people have stepped in to correct the text and in so doing have made a wonderful contribution to this resource, and helped to improve search results. The following table lists by month the people who've corrected the most lines of text.
Total number of lines corrected for all time : 227,916,628
Total number of correctors 47,242