Thematics, Errors on stamps., **/*/used collection on leaves. "Human Errors", classics to about 1970s. Nice described hugh collection on album pages with a lot of facts presented regarding what is wrong in the stamp motif. Written in English on more than 400 pages. Stamps from all world. Please inspect and see a selection of scans at www.philea.se. Good start of an exhibit. (approx 2500). Mostly fine quality