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Leffingwell, Ernest De Koven books & textbook

Conquering the Arctic Ice

Mikkelsen, Ejnar  Howe, George Plummer  Leffingwell, Ernest De Koven  

Legare Street Press /2022-10-27 Hardcover / 494 Pages
isbn-10: 1015891071 / isbn-13: 9781015891074
   

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The Canning River Region, Northern Alaska, Issues 109-110

Ernest de Koven Leffingwell  

Legare Street Press /2022-10-27 Hardcover / 312 Pages
isbn-10: 1017265844 / isbn-13: 9781017265842
   

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