Leffingwell, Ernest de Koven 1876 books & textbook
Conquering the Arctic Ice
Mikkelsen, Ejnar 1880- Howe, George Plummer 1879- Leffingwell, Ernest de Koven 1876-
Wentworth Press /2016-08-25 Paperback / 496 Pages
isbn-10: 1361262494 / isbn-13: 9781361262498
