60s-70s Japanese Pressings Rolling Stones, Mayall,

I recently got a stack of 1960s and 1970s LPs pressed in Japan. Rolling Stones, Donovan, Canned Heat, john Mayall, etc.

I can't find any information on these obscure records. All are packaged in very thin, plastic-lined sleeves . I cleaned, then listened to Donavan's "Sunshine Superman," and thought the quality was very high.

Anyone know a source for information about Japanese Pressings of rock and roll / pop music from the 1970s?

Thanks in advance for your input.