Text ( visual ) : unmediated Dragon's teeth / Upton, Sinclair. -- 1. -- Safety Harbor, Fla. : Simon Publications , 2001, c1942. -- 319 p. ; 23 cm. -- ISBN 1931313032 ; (BA66654216) ; https://ci.nii.ac.jp/ncid/BA66654216 Author Heading(s): Sinclair, Upton