Actually, I've found the Columbia ones, but they're not what I'm looking for. These were called something like "Country Hits of the 1940s" (and 1950s and so on) or maybe "Country Classics of the 1940s" (etc).

They had all kinds of great and long-forgotten songs on them, including things like Cigareets and Whiskey and Wild Wild Women, and a bouncy ditty that started:

"Early one morning I was doing my rounds; took a shot a' cocaine and I shot my woman down; I went home and I went to bed; stuck that lovin' 45 beneath my head" and went on to tell a sad story of legal retribution, interspersed with cheery accordian breaks.