Boy scouts in the North Sea, or, "Mystery of U-13"

Ralphson, G. Harvey2017-01-302017-01-30179http://hdl.handle.net/123456789/136888https://digitallibrary.punjab.gov.pk/handle/1/4250268 p.en-USBoy Scouts of America -- Juvenile fiction.Boy scouts in the North Sea, or, "Mystery of U-13"Book