Diary

The Diary is an item that was twice denied an appearance in the Tomb Raider series but eventually appeared in Tomb Raider: The Angel of Darkness in the form of Werner Von Croy's notebook.

Tomb Raider: Featuring Lara Croft
In the first game, the diary once occupied the place that was eventually taken by the Natla Technologies map and later by a compass. This diary is probably the one that belonged to Colonel Arther Hamilton Graves, seen in an early FMV.

Tomb Raider: The Last Revelation
Again, a diary was intended for the fourth entry in the Tomb Raider series. This time it was the 'Croft Diary'. Apparently many notes were able to be viewed, dating back to Lara's younger days including photographs of her adventures and friends. If the player is hindered by a puzzle then they could turn to the diary for hints and clues.

Trivia

 * Lara Croft GO has diaries in the title menu for chapter and level selection.