How about this find!!!
A 1972 irrigation map from Highlands CC! I was cleaning out my survey/map storage and came across this; something I never saw before. This is a true single row irrigation system!
I liked the note, I assume that Tom is Teeter Smith in this case and Marion (an irrigation installer/consultant??) is asking him to mark which irrigations heads have been added by in-house employees . This is one for the archives!