H&B Recordings also sends out a hard copy catalog. It’s a low-budget production catalog, crammed with listings that’s very dry reading. And you have to know your composers to get what you really want. But they have probably the broadest cross-section of classical music recordings I’ve seen just about anywhere.
H&B sounds a lot like the Dover catalogs - tiny print and minimal descriptions, but much treasure there if you know it when you see it . . . .