This link is to a 1962 video about a two-story sod house, very unique for this time.
http://www.nebraskastudies.org/0500/stories/0501_0108_03.html
(if the video will not play, you will probably need to update your Adobe Shockwave Player. It is a free download and if you do a search for "Adobe Shockwave," you should have no problem.)
Source: Nebraskastudies.org: Dr. Robert Manley at the Haumont House, from the ca. 1962 NET program Nebraska Heritage.