Nighthawk poster measurements?

Sorry to bother, but does anyone know the measurements for the nighthawk poster? I'm looking to frame it and wanted to get as close as possible. Also, I tried searching but it gave me an error, so I do apologize if this has been discussed before.

It is 18x36

@edder: Thank you!

Thanks @edder! Came here to ask the same thing, got my poster today but don't want to take it out to measure it until ready to be framed.