These letters relate to:
Society of Experimental Biology Symposia I - Nucleic Acid
Cambridge Economic History Volume 1
A Historical Geography of England before 1800 by Darby, H.C.
Our Early Ancestors by Burkitt, M.C.
Comparative Productivity in British and American Industry by Rostas, L.
Wages and Income in the United Kingdom since 1860 by Bowley, A.
Cambridge Ancient History Volume 12
Cambridge Medieval History Volumes 3 and 4
A Picture Book of the Whole Coast of England by Steers, J.A.
The Growth of Physical Science by Jeans, J.