Saving lost referenced files
I am running Aperture 3.4.5 on a Macbook Pro 10.7.5 OSX. My problem started when I imported my photos from iPhoto directly into my new Aperture library. Because of space limits I deleted my iPhoto library. I soon found that all of my imported photos could not be edited, or exported because they are "referenced files". I receive the error message "The selected original image is either offline or not found. Please reconnect it and try again". I understand it may be impossible to recover the deleted originals, but I am still able to view the referenced file in Aperture. I do not want to risk losing these important photos, is there a way I can save the highest quality previews into a folder outside of Aperture? Mahalo in advance!
MacBook Pro, Mac OS X (10.7.5)