The website below has interesting and useful charts: there is a glossary of terms (check out the term 'measurement' - it gives lengths of link, chain, etc.); a list of old occupations, a list of wars, battles, etc. which is in date order so one can check to see if an ancestor may have been affected and last, there is a chart of old deseases. Note: I downloaded all the listings and there was 14 pages of info. Karl MacEachron Fresno CA http://members.tripod.com/silvie/charts.html