DB results question

My DB results page lists 2 fields: a list of names on maps and a link to the
map's home page. The database it gets its info. from has 3 fields: the above
2 and another one-letter code of the map.

I'm wanting the results to list the placename and a simple "Go here"
hyperlink (I know how to do this part). My problem is: in the DB, the various
maps have just a one letter code to identify them - how can I use this to
link to the map's home page?

TIA

Mart