Editore: Hubbard College of Scientology, Sussex, England, 1966
Da: Xochi's Bookstore & Gallery, Truth or consequences, NM, U.S.A.
Paper Back. Condizione: Good +. No Jacket. Sharpe, Reg (photos) (illustratore). 58pp.; SC white plastic comb-binding w/no title on spine; white w/blk.&green; rubbed w/stains; PONft.cover; labels,inside ft.cover; clean,tight pgs. How the E-Meter works. illus. Clearing Series: Volume IV.