I'm reading an old scientific paper from the 1980s, and I'm curious about one of the abbreviations it uses in a fairly admin part of the paper:
Single issue price Dfl. 77.00, postage included.
(This is the paper, in case it's relevant.)
I asked the internet what the "Dfl." means but none of the answers really apply. I imagine the answer probably speaks to some bygone method of distribution of literature, which makes me more curious. Can someone clarify this?