#USGS CD-ROM
VistaPRO is available on Amigas and on MS-DOS systems (maybe more).
On the Amiga they have two versions with differing features and
costs. The less expensive version is about $60 typical retail.
There are also some companies which reformat the USGS data and
re-offer it. This would probably be available through a company in
the Denver area called RockWorks (don't have address/phone # at home
– sorry). They are a dealer in software for geology and earth
sciences.