I am looking for a series of images, such as what you typically see in a high performance driving manual progressively showing the line through a typical corner, i.e. one where the first image shows the geometric apex, then another shows an early apex, etc. If anyone has any that can be posted, that would be great.

This is an autox demonstration, so I don't know if this is what you are looking for, but check out this link:

Solo manual (http://www.wtfstables.com/rmsoloschool/)

When you open the presentation, you will have to click on the "Next" cone to get to the second page, then click on "Start." On the next page, there are tabs at the top toward the right. Click on the "Driving" tab. Using the "Next" cone at the bottom of the page, skip ahead to page 7 (of 16.) There is a slider on the right side of the diagram that lets you compare the different lines for early, neutral and late apex corners.

Does this help?

Scott