Notes: Tom Swift Jr. Series #3. 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. 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 TS #15 (Selector), back flap to TS #13 (Solartron), and back cover to HB #38 (Devil's Paw). Second verification copy differs from the first in the following points: Half title to TS #8 (Nuclear Fire); variant dust jacket state with "100100" and "110-160" codes on front flap, back flap with Hardy Boys list to HB #36 (Pirate Hill), and back cover with Tom Swift list to TS #9 (Satellite). Price from Tuck.