SYS10/SYS of TRSDOS v1.3, which handles the DISPLAY DIRECTORY routine as well as the BASIC Error Messages, has been disassembled and commented. It can be found here and the entire TRSDOS v1.3 disassembly project to date can be found here.
Dusty has scanned the missing Volume 3 of the NATGUG Newslettes. They can be downloaded here. Thank you Dusty!
While Dusty has scanned volume 4 as well, I already had such so I will not be using his copy. Two issues which had missing pages (Vol 4 Issues 3 9), though, are now complete!