Great article, thanks! Also the first I'd heard about Young Indiana Jones at the World's Fair, with a synchronization gear as the MacGuffin. The documents come from Aric Wilmunder's site
, which also has a 6-page Last Crusade "concept document" from 1988. When the Grim Fandango puzzle document was quickly pulled from the internet, I figured we'd never see some of these PDFs. Download away!