From an earlier thread where Jim and I discussed buying plans:
You can still get plans from Robb Whites sons. You just have to send a $75 check and a letter to their P.O. box. It's an odd way to get plans nowadays but not so strange before the internet.
This is what their website says:
I do not have any email capability nor do I talk on the telephone. You can write me a plain old letter at P.O. Box 561, Thomasville, GA 31799. If you search the online phone books, you might come up with a Robb White in south Georgia but that is not me and that woman is tired of having to drive to my shop to tell me that somebody is desperately trying to get hold of me.