I was reading the wiki article on Roadside Picnic and was sure I had read it. However, the article contains many details I don't recall.
The version I recall reading was relatively short, involving a single, or perhaps two, trips into "the zone". Additionally, the zone was clearly in the UK somewhere and there are various mentions of locations and other details (I recall a British helicopter in particular).
Am I misremembering this? Or was there another, shorter, version of the story?