There are published books about the history and genealogy of Balestrand and Leikanger. They were of course written in Norwegian -- but I've used similar books with great success by adding a good Norwegian-English dictionary to my personal reference collection and working at translations of the parts pertinent to my own research.
"Balestrand : bygd og ætter" by Jon Laberg
"Leikanger bygdebok" 2 volumes by Per H. Bøthun, Roald Lyngvær
http://homepages.rootsweb.ancestry.com/~norway/bygdebok.html