About 600 books and 66 serials mainly relating to entomology and the natural sciences. The strength is works on British entomology but also includes Europe, North and South America. About one-third were published in the 18th and 19th centuries.

About 3000 books and pamphlets, mostly published in Britain, the majority on astronomy but also some works on geology, physics and chemistry, as well as a small group of Tanock's personal papers.

431 books, mostly Russian works published in countries other than the Soviet Union, including China, the United States, and Australia, in the years after 1917.

Around 6,000 books, mostly in Portuguese, mostly relating to literature, history and religion among many other topics.

Around 270 books, pamphlets and serials, mostly published in the Philippines 1900-1965 but also some items from the USA, Spain and Spanish-speaking countries.

3300 books and serial issues in a range of languages relating to Asian and European literature, politics, history, religion and more. 

About 6200 books about European literature, history and culture, mostly published in the period 1880-1960. 

About 4000 books, mostly published in France in the 19th and early 20th century, as well as a number of German, Italian, Latin and Greek books.

Two collections of pamphlets published in the Netherlands from 1567-1852 dealing with political, diplomatic, military and legal matters, and the administration of the Batavian Republic.

3099 books & pamphlets, plus modern facsimile editions of medieval manuscripts with a strength in English philology, including English dialects, as well as European poetry, novels, literature, and religion.

Around 400 Slavic monographs, 700 pamphlets on the economics and politics of Europe from the 1930s-1970s, and miscellaneous Harvard University departmental reports and academic papers.

2457 plays published in France between 1701 and 1840. They include tragedies, comedies, historical dramas, vaudevilles, comic operas and operas.