There are two indices to the photo album, the NUMERIC Index and the SURNAME Index.

The NUMERIC Index lists the photographs in the order in which they appear in the album.
Clicking on a caption will take you to that picture.

The SURNAME Index lists all people who appear in the photographs alphabetically by surname and then by forename.
People with more than one surname, usually because of a marriage, are listed under each known surname.
Clicking on a photograph number will take you to that picture.