010645: Boards are Blue Tweed. Front cover has "TOM SWIFT Jr." and his portrait on it. No dustjacket. Boards have light rubbing along edges and corners. Otherwise, pages are clean, unmarked, tightly bound and sharp cornered. Scarce, Out Of Print, Book. "From the moment Tom swift finds himself tossed about helplessly in an undersea geyser to the time he faces possible death at the hands of his enemies, the young scientist fights to overcome many obstacles in putting his two latest inventions to use. When Tom discovers that helium on the ocean bottom had caused a geyser, he plunges into the task of building an underwater city of derricks and pipelines to capture the gas. His astounding new water-repelling machine and phenomenal hydrodome make the gigantic operation possible.": Vol. 11: 5 x 7.5 in.: 184 pages