The complete evolutionary works of Charles Darwin have gone online, including the stolen notebook he carried in his pocket around the Galapagos Islands.

Tens of thousands of pages of text and pictures and audio files have been made available, including some previously unpublished manuscripts and diaries of the great British scientist.

Among the unique collection is the notebook used during the Beagle voyage which would later forge his scientific arguments. It was stolen in the 1980s, but Darwin’s great-great-grandson hopes the publication online, thanks to a transcription from a microfilm copy made two decades earlier, will persuade whoever has it to return it. “It has huge importance for the history of science,” Randal Keynes told reporters.

Other items in the free collection of 50,000 pages and 40,000 images are the first editions of the Journal of Researchers, written in 1839, The Descent of Man, The Zoology of the Voyage of HMS Beagle, and the first five editions of the Origin of Species.