Extract a certain field from a collection

[Valerio Ricci]

Hi everyone,
Recently I was trying to extract the list of ISBN of my collection to add them
to anobii (honestly I don't think that it is a good way to catalog books, but I
was interested to book suggestions that the site offers and, privacy apart, I
decided to have a look at it). The problem is that I couldn't find a way to
export in a plain text file (or something like that) only ISBN values. Surely I
can create a template to select only a certain field, but it is not so "user
friendly". Is there a simpler way to do this operation without "playing" with
templates?
If there's no such a feature will not be a good idea to implement something like
export selected field only?
Thanks

Valerio