The quality British edition hardback of this celebrated philosophical textbook. Not the Indian paperback frequently offered as a 'bargain'. 

Herbert Roberts practised in the USA and was a student of Stuart Close.

This elucidates the Organon - Invaluable for philosophy students.

Having this in hardback is an advantage as this is a work that merits re-reading and study alongside the Organon - This title can be kept open on the desk while referring to the Organon.