The tag lincoln appears in these 3 comics:

• 87: (08/17/2013) Space Lincoln (Tags: mike, ashley, chris, undergrads, lincoln)
• 112: (02/08/2014) Is that the best idea she could come up with? (Tags: ashley, chris, lincoln, booth)
• 125: (05/10/2014) Kerbal (Tags: mike, ashley, jeb, lincoln, marty)