What is this "White Booklet" which the PDF manual of Robinson's Requiem constantly refers to? I know the manual itself is white but none of the info it mentions is available there.
If this is a guide that came with the game, I'd love to see it added on GOG.com as an extra, since the game does tend to be quite hard without knowing your way around the wilderness.

It's a handbook which explains the in-game computer system, gives hints on what to do in various situations (such as how to feed yourself and how to handle medical emergencies), and includes a mission report which also contains some hints.
It's maybe not 100% necessary, but it should definitely be included as it contains a lot of extremely valuable information.
(I can confirm that it is not part of the documentation included with the GoG-version)

It is now!
Have to hand it to GOG.com, they're a really great bunch of guys and girls. I wouldn't have believed we'd still get this much support for such old games.