Thanks for your help. By the Family Search catalog do you mean this?https://www.familysearch.org/#form=catalog
If so, then no, I had not. Thanks for the tip. Doing a quick search revealeded five family history books which mention Vredenburghs. Is this what you meant?
I see that for $5 I can have some of these sent to a "Family History Center" which is 45m from my house. Exactly what are these FHC facilities...on Google streets it looks like a church?