Map: https://i.imgur.com/awdjMxj.jpg
edit: higher quality image
Was posted to /r/romania, /r/mapporn and now dataisbeautiful.
I'm not sure they used hl for everything or of it's just this case, but I'm curious as to why they used hectolitres at all.
Grain products were always measured by volume rather than by weight- it was a whole lot easier to measure bulk quantities that way if your weighing devices were restricted to steelyards and the like. The principal Imperial/American unit of dry measure was the bushel, equivalent to 8 gallons.