found: Hendricks, G. The second centering book, 1989, c1977:CIP t.p. (Thomas B. Roberts)
found: LC data base, 1-11-89(hdg.: Roberts, Thomas B.)
found: Psychedelics and spirituality, 2020:t.p. (Thomas B. Roberts, Ph.D.) back cover (professor emeritus at Northern Illinois University)
found: Amazon UK website, viewed 3 Nov. 2022:author profile (Thomas B. Roberts promotes the legal adaption of psychedelics for multidisciplinary intellectual uses, primarily their academic and spiritual implications)
found: British Library email from Thomas B. Roberts, author of "Psychedelics and spirituality", recd. 3 Nov. 2022(Tom Roberts; confirms same as author of "The second centering book")
