Weekend stamp work

This weekend I tried to get some stamp work done each day. I soaked Great Britain commemoratives and a few bowlfuls of mixed worldwide kiloware and these stamps are in my drying books currently. I also sorted some of my many Machins, and have started identifying some of the more recent, higher value ones. I should be able to get an idea soon of what I have and what I need in the Machin issues of the last 5 years or so.
I have not yet found any of the postcard rate or foreign airmail rate Machins! I would be interested in purchasing used copies of these stamps if anyone has any, or better yet, if anyone can mail me covers/cards with these stamps on them, tell me what you want in exchange. : )

I also worked on separating and sorting South Africa stamps. I have a box full of South Africa bundleware that someone gave to me some time ago, and I have slowly been separating the bundles one by one and sorting the damaged stamps from the collectible stamps. This collection contains mainly definitives, in heavy duplication, although they are some commemoratives. They are from the 1960s and 70s for the most part. I have also been setting aside the readable postmarks. There are quite a lot of stamps in this box.
Does anyone know of any good references for South Africa stamps? I'd love to be able to study these stamps more thoroughly since I have so many of them. I used to have a very nice South Africa catalog, but I can no longer remember who published it.
If you are interested in stamps from South Africa, I can make up a packet of about 50 different stamps for anyone who might like to make a trade. You can email me if you are interested. I would be interested in stamps from any British Commonwealth country in exchange.

Regards,
Suzi
suziboyer@gmail.com