Nigeria was formed from three separate colonies and the arrangement of these books of statistics reflects this. The statistics for Lagos, at the front of this group of documents, run from 1863 until 1905. Lagos became a part of Southern Nigeria from 1906 until 1913 and the records for Southern Nigeria follow those for Lagos. The statistics for Northern Nigeria then run from 1900 until 1913. Blue Books of statistics from 1914 until 1940 cover the whole of Nigeria. These books include population data, accounts and lists of the colonies' officers. Details of its trading partners and social services are also in these records. Each book has a contents page at the front so that you can see if the data set you need is included.