When Sir Ernest Shackleton set off for Antarctica on his ship Endurance, he made sure he had plenty of reading material. But details of precisely what books he took have remained hidden in this photograph - until now.
The image from the ill-fated South Pole expedition - taken in early March 1915 by Australian photographer Frank Hurley - has been digitised by the Royal Geographical Society in London.
It is now known that the explorer carried with him dictionaries, encyclopedias and books chronicling other dangerous polar expeditions.
He took established works by Dostoyevsky and Shelley - but also, explains Alasdair MacLeod from the RGS, "newly published fiction by popular authors of the time".
"The cabin wall on the left also shows a framed print of Rudyard Kipling's poem 'If', which Shackleton carried with him on to the ice floe when the ship sank."
In January 1915, Endurance and her crew became trapped in ice in the Weddell Sea. Shackleton and his men would remain there for 10 months - until the ship sank. They then spent the best part of another year on the ice, before all 28 of them were rescued.