Maprunner's downloadable guide to IOF orienteering control descriptions.
Try the Maprunner IOF Control Description Quiz.
You can download copies of the Maprunner Guide to IOF Control Descriptions below. The files are available as a gif image or a PDF and are designed for printing at A4 size. If you are having trouble then try right clicking and select “Save Link As….” (or whatever your browser equivalent is) to copy the file to your computer first.
The complete IOF Control Description 2018 specification
is available from the IOF web site