The file is referred to in 1 page
Provenance
graphic remade from PDF file of same name. original data source Koni Steffen Research
ReuseThis item is offered under a Creative Commons Attribution-NonCommercial-ShareAlike license
http://creativecommons.org/licenses/by-nc-sa/3.0/ You may reuse this item for non-commercial purposes as long as you provide attribution and offer any derivative works under a similar license.
