Notes: Verification copy lists books up to #13 (1958); this is #10 (1957). Hence this copy may be a 2nd printing, or may have been listing upcoming books near publication status.|| Tom Swift Jr. Series #10. Later printings are not noted on the title or copyright pages. Printing priority and relative dates established with Tom Swift (TS) title lists on the reverse of the half title and back jacket flap, and Hardy Boys (HB) title list on the back jacket cover. Second verification copy has the following points: Bound in blue tweed cloth lettered in dark blue with face of Tom Swift stamped in dark blue on the front cover, illustrated endpapers. Dust jacket with "100100" and "110-150" codes on front flap. Inferred 1960 printing date based on half title and back flap lists to TS #13 (Solartron) and back cover list to HB #38 (Devil's Paw).