The options for searching and browsing the catalogue are on the left of the home page above the 'newest additions' section. They can also be accessed from the dropdown Browse button to the left of the search bar. These include the options to browse:
•    Mills
•    Unidentified mills: Select this to browse through images of mills we have been unable to identify. Please contact us if you recognise any
•    Images and documents: Select to browse both images and documents
•    Images only: Select to browse only images
•    Images by country and mill type: Select countries, counties and mill types to bring up all related images
•    All collections
•    Featured collections
•    Subjects
•    People/organisations
•    Partner archives: Hosted archives from our heritage partners and corporate friends

Once you have brought up a set of search results, you can further filter by using the column on the left and the Advanced Search options at the top of the page.