I have been researching around isotypes again.
HERE is a web archive of the isotypes created by Gerd Arntz. Some blurb from the site about isotypes;
The International System Of TYpographic Picture Education (Isotype) was developed by the Viennese social scientist and philosopher Otto Neurath (1882-1945) as a method for visual statistics. Gerd Arntz was the designer tasked with making Isotype’s pictograms and visual signs. Eventually, Arntz designed around 4000 such signs, which symbolized keydata from industry, demographics, politics and economy.
And some examples;
The bottom isotype is of an unemplyed man. The image to the right shows Arntz working on this illustration.