Definition of "trufan"

On either side of him were numerous parks and gardens, great and small, and of varying types of beauty, and in them walked shining, godlike figures whom he knew to be Trufans.

1954 February, Walt Willis, Bob Shaw, chapter 18, in The Enchanted Duplicator‎, page 26

And even though I have gone on to find other interests, I remain at heart a "trufan."

1975 March, Joe Pumilia, “The Vulcan Invasion”, in KPFT‎, volume 2, number 7, page 1

It is difficult to put into words, but for the "trufan" science-fiction or the magazines entered his life more than a hobby and only a little less than a vocation. Over and over one encounters the statement that when a trufan discovered science-fiction he/she found a fulfillment.

1998, Everett Franklin Bleiler, Science-fiction: The Gernsback Years‎, Introduction, page xxix