For Rees's Cyclopaedia he wrote about history, but the topics are not known.

The speakers' topics are divided by interest and known as "classes".

The topics are not known, but probably medical.

This topic is about spinal stenosis of the lower back, also known as the lumbar area.

For Rees's Cyclopaedia he contributed articles about electricity, but the topics are not known.

He was a contributor to Rees's Cyclopædia, writing articles whose topics are not known.

The topic is not known to be on the agenda of any of the postal or business administrative standard organisations today.

This topic has been known as "geometric engineering of quantum field theories".

Each debater speaks for 3-4 minutes and all topics are known at least a week in advance.

There are no reply speeches and topics are known at least a week in advance.