This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
blackandwhite monochrome black and white Shows unidentified New Zealand soldiers seated at desks. They are looking at financial balance written on blackboard that an instructor is highlighting with wooden pointer. To the side another blackboard has the headings Purchase Sales Day Book and Credit Sales Day Book with entries under each.