ESKIMO-ALEUT
     Aleut [southwestern Alaska]
     Eskimo
          Yupik [western Alaska and easternmost Siberia]
          Inuit (=Inupiaq) [northwestern Alaska across the
               northern coast of Canada to Greenland]


NA-DENE
     Tlingit [southern Alaska]
     ?? Haida [Queen Charlotte Islands]
     Athabaskan-Eyak
          Eyak [southern Alaska]
          Athabaskan
               Alaska: Ahtna, Tanaina, Koyukon, Kutchin, Han,
                    Ingalik, Holikachuk, Kuskokwim, Tanacross
               Canada: Tahltan, Slavey, Hare, Dogrib, Chipewyan,
                    Beaver, Sekani, Sarcee, Carrier-Chilcotin, 
               Kwalhioqua-Tlatskanai
               Pacific Coast Athabaskan: Umpqua, Tututni,
                    Applegate-Galice [all on the Oregon coast],
                    Chetco-Tututni-Coquille [Oregon & California,
                    from Coos Bay to Crescent City], Hupa, Kato,
                    Mattole, Nongatl, Wailaki, Sinkyone, Nongatl,
                    Lassik [all on the northern California coast]
               Apachean: Kiowa Apache, Navajo, San Carlos Apache,
                    Chiricahua Apache, Mescalero Apache,
                    Jicarilla Apache, Lipan

     The Athabaskan languages do not subgroup neatly.  The
     languages of Alaska, Yukon, Northwest Territories, and
     British Columbia are really a dialect continuum; "Alaska"
     and "Canada" in this list are purely geographical labels. 
     Pacific Coast Athabaskan represents a distinct subgroup;
     within it Hupa and maybe Umpqua represent distinct
     languages, the others are a dialect continuum.  Kwalhioqua-
     Tlatskanai, spoken around the lower Columbia (both now
     extinct), are connected to both the northern and the Pacific
     Coast languages.  Apachean is also a distinct subgroup, but
     again, the languages within it seem to be a dialect
     continuum rather than a set of sharply distinct languages.

     Whether Haida belongs to Na-Dene or is an isolate remains
     unclear.