Jim Mossman
The Obbie-2 set, the author writes:
Transitioning upward from Olive to Brick, two color ranges from The Vermonter are toned down and the middlemen (yellows) eliminated. With this set topo will still show as a very important map element, but a wider range of colors is left available for depicting other features.
o2 a
o2 b
o2 c
o2 d
o2 e