Some more information on Topaz sweet potato.Excellent variety you have probably never herad of. A search only reveals this link.
https://www.researchgate.net/publica...;_Sweet_Potato
Using key phrases from this document was able to find Topaz in other variety trials.
https://www.semanticscholar.org/pape...85d9b/figure/0
https://www.semanticscholar.org/pape...85d9b/figure/2
As you can see, Topaz won almost every trial for yield and was judged best baking sweet potato. The only reason it was not more popular is probably because it was released about the same time Beauregard was.