In my experience, there is no such thing as a "long play album." This terminology is being confused with the correct "long playing record." An "album" is usually considered the volume of work that is recorded on the record or CD.
After the large diameter, high speed 78rpm records came the 45rpm - a smaller diameter record that was typically one song on each side. Then technology allowed us to play recordings at 33rpm on a record of much larger diameter with good fidelity. Those vinyl discs became known as "Long Playing" records (or "LP’s") because you could get (typically) five or six songs on each side.
After the large diameter, high speed 78rpm records came the 45rpm - a smaller diameter record that was typically one song on each side. Then technology allowed us to play recordings at 33rpm on a record of much larger diameter with good fidelity. Those vinyl discs became known as "Long Playing" records (or "LP’s") because you could get (typically) five or six songs on each side.