The national parks portfolio . it* fv^^ i^-^i r\- ^ ^ jH ft * « y^v *«n»:- E^f •%^f ^* * ^ r , •? ? . ?:liff. ;, J%v:::^. , ^1 - Jd^B| H . t:r- 1^ ? ^ ??iB ^ * ^ . -1 1 HI. Photograph by Curtis & Miller Looking into a Great Crevasse in the Stevens GlacierCrevasses are caused by the swifter motion of the middle than the sides. This ice is 400 feet deep THE GIANT RIVERS OF ICE

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Keywords: ., bookauthorunitedstatesnationalp, bookcentury1900, bookdecade1910