YANGON, Myanmar — As many as 140 World War II Spitfire fighter planes — three to four times the number of airworthy models known to exist — are believed to be buried in near-pristine condition in Myanmar. A British-Myanmar partnership says it will begin digging them up by the end of the month.

The go-ahead for excavation came earlier this week when the Myanmar government signed an agreement with British aviation enthusiast David J. Cundall and his local partner. Cundall, a farmer and businessman, earlier this year announced he had located 20 of the planes, best known for helping the Royal Air Force win mastery of the skies during the Battle of Britain.

On Thursday, however, a retired Myanmar geology professor who has assisted in the recovery operation since 1999 said there are about 140 Spitfires buried in various places around the Southeast Asian country, which until 1948 was a British colony called Burma. He did not explain the discrepancy in estimates.

Soe Thein said the British brought crates of Spitfires to Myanmar in the closing stages of the war, but never used them when the Japanese gave up the fight in 1945. The single-seat version of the fighter plane was 30 feet long with a 37-foot wingspan.

The U.S. Army was in charge of burying the planes after British forces decided to dispose of them that way, he said, adding Cundall interviewed at least 1,000 war veterans, mostly American, to gather information about the aircraft's fate.

He said a ground search was started in 1999 using magnetometers and ground radar, but faced difficulties. Only in recent years did technology become advanced enough to be more certain of the finds, he said.

Each plane was kept in a crate about 40 feet long, 11 feet high and 9 feet wide, said Soe Thein.

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