This might be useful. Passports contain a short country code, which appears in a couple of places on the main page:
If you want to know which country it relates to, this Livesheet by Avron Marcus will tell you.
Just enter the country code and it tells you the country. In the example above, the country code is GBR.
The direct link is: http://uncharted.livesheets.com/forms/e17fe37c0c8df6195712af47996d3c06127ef84e
And the embed code is:
<iframe frameborder="0" height="320" marginheight="0" marginwidth="0" scrolling="no" src="http://uncharted.livesheets.com/forms/e17fe37c0c8df6195712af47996d3c06127ef84e" width="480"></iframe>