Accessing Library of Congress from FM

[BenhamTroll]

I'm trying to design a fairly stripped down FM db that will allow collect data from the Library of Congress to create a library catalog for a small school library.

I would like to make it so that the user could enter the ISBN, and the database would query the LOC (most likely via Z39.50), and then have specific data (title, author, date, LCCN, and Dewey number) entered into a record.

Anyone have any advice on the best way to do this?