Suteetat,
If it is not clear on the record label or cover, the code on the cover's spine or label should allow you to figure this out. Check those codes at Discogs, probably the best place to look for pressing details. And as for buying mono, be sure you are clear on if a mono record is a fold-down (created from a stereo recording; less desirable) or true mono. Steve Hoffman forums and other spots can help you figure that out.
If it is not clear on the record label or cover, the code on the cover's spine or label should allow you to figure this out. Check those codes at Discogs, probably the best place to look for pressing details. And as for buying mono, be sure you are clear on if a mono record is a fold-down (created from a stereo recording; less desirable) or true mono. Steve Hoffman forums and other spots can help you figure that out.