Thank you so much for picking up the game! This is something I missed when distributing (didn't occur to me to include a world worksheet in the physical books) - but it's just the image on this page here (the bottom grid map image with numbers) - you should be able to right click that and save the image, or send me an email at perplexingruins@gmail.com and I can send it that way.
Sorry for any inconvenience.
All best PR