Book excerpt: This book is designed to provide those interested in the history of landed estates and Irish big houses, with practical advice regarding the availability of primary sources, their strengths and weaknesses. It examines the vast array of sources available for the study of big houses, other than estate papers, such as published and unpublished auction catalogues, photographs, oral archives and architectural drawings, and provides an overview of the history of landed estates and big houses in Ireland from 1800 to the present day.