One of the slide shows of Lawrence holding the wrist he broke in 1926
Negatives of iconic photographs taken of Lawrence of Arabia and letters penned by a passenger of the doomed Titanic were sold for £25,701.
The pictures showing the Word War I hero in India in the 1920s were estimated to sell for £1,500 at Duke's Auction House in Dorchester, Dorset.
But a UK-based private collector used a telephone bid to buy them for £6,572.
Meanwhile, a US telephone bidder bought the letters for £19,129 on Friday - nearly double their £10,000 estimate.
It had been thought the negatives of Thomas Edward (TE) Lawrence were lost in the 1930s, until a photography expert found them among items he had bought at auction seven years ago.
The seller, who wants to remain anonymous, said he found the glass plates inside a Victorian stereo viewer he bought at auction in Bournemouth for £32.
Lawrence, who lived in Bovington, Dorset, died in a motorcycle crash near his home in 1935.
Titanic passenger Charles Jones, who had worked for the Colgate firm in New York, had been returning to the US after a UK trip to buy sheep from Dorset farmer James Foot.
Mr Foot received Mr Jones' last letter on 15 April, the actual day the Titanic sank, killing 1,522 people on board, after hitting an iceberg.
He wrote his note on White Star headed paper.