"the London Directory, the ‘Red’ and ‘Blue’ books, Whitaker’s Almanack, the Army and Navy Lists"

The London Directory is a listing of commercial traders in London.

The ‘red’ books were directories relating to the court and nobility.

The ‘blue’ books were government publications with blue covers.

Whitaker’s Almanac is a reference book on a variety of topics, published annually.

The Army and Navy Lists are lists of all serving officers of the army and navy (no longer available to the public).

The Law List was a directory of professional lawyers.