"A third edition of 'The practice of absorption spectrophotometry', with Hilger instruments. 1st edition by F. Twyman, 1932. 2nd edition by F. Twyman ...
"A third edition of 'The practice of absorption spectrophotometry', with Hilger instruments. 1st edition by F. Twyman, 1932. 2nd edition by F. Twyman and C. B. Allsopp, 1934."