I published a CoCo 3 Quick Reference Guide back when I was publishing "the world of 68' micros". It seems that the only ones in the archives are the OS-9 and OSK Quick Reference Guides though. I'm pretty sure I did one for the CoCo3 Extend Color BASIC... ftp://maltedmedia.com/coco/MANUALS%20by%20company/FARNA/Quick%20Reference%20Guides/