Ambulance - LEGO set #6680-1 (Building Sets > Town)
VINTAGE LEGO 6680 1980's LEGO Town Ambulance £25.00 - PicClick UK
Lego 6680 Ambulance (1981) - LEGO - LastDodo
LEGO MOC 6680 Ambulance Plane by kejv2 | Rebrickable - Build with LEGO
LEGO 6680 Ambulance Instructions, Rescue
1980 Lego Ambulance Set #6680, 100% Complete, Original Box + Instructions | #778439435
Here's some Lego history for you. These are some instructions of my father's sets from when he was a child. Some pages are missing, but I thought I'd show what I have.
Lego Instructions: Ambulance (6680) | eBay
LEGO 6680 Ambulance Set Parts Inventory and Instructions - LEGO Reference Guide