Anne Marie Wheeler explores bomb shelters from the 1961
Community Fallout Shelter Program. She visits caves that were
used as shelters in sparsely populated, but militarily
important, parts of Idaho:  In an area with very few large
buildings capable of supporting a community shelter, and an
economy that certainly wouldn’t support a new, large suburban
shopping center, the cavernous landscape provided a natural, but
very afterthoughtish answer to the shelter question. I haven’t
found a whole lot of information about what made certain caves
suitable shelters and others not, aside from the ability to
create a "spot" within the cave turned shelter for less than
$100 ($775 in 2012). A spot seems to have included 1 quart of
water, 700 calories of food (that’s one Big Mac) per day, along
with, sanitation supplies (toilet paper, cups, etc.) and
radiation detection instruments for one person. No word on
bunks, blankets or anything of that sort.