Hastily-Written Note is a log. It provides a clue to the location of the Guide to Mechanical Engineering: Volume 3, needed for the quest, The Frightened Engineer.
Location[]
It is obtained from examining the note in the Repair Bay in the Geothermal Power Plant.
Log Text[]
Borrowed a copy of the "Young Spacer's Guide to Mechanical Engineering." I think it's Volume 3. I need something to read down in the pit.
Much obliged!
C. Higgins