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New York – Newly disclosed letters written by the father of Anne Frank illuminate his desperate attempts to get the family out of Nazi-occupied Netherlands.

The YIVO Institute for Jewish Research, a New York-based institution that focuses on the history of Eastern European Jews, said Thursday that it discovered the file among 100,000 other Holocaust-related documents about a year and a half ago. The institute did not immediately disclose the find because it had to explore copyright and other legal issues, said Cathy Callegari, a YIVO spokeswoman.

“We have come across the file which belonged to Otto Frank, documenting his efforts to emigrate his family and get them out of Holland,” she said.

On Feb. 14, she said, the institute will release Frank’s letters and documents and records from various agencies that helped people emigrate from Europe.

The disclosure came as a surprise to Bernd “Buddy” Elias, Anne Frank’s cousin and the president of the Anne Frank Foundation. The organization, established by Otto Frank, holds the rights to Anne Frank’s writings, according to its website.

“We would love to have them in our archive. I mean, we are the heirs of Otto Frank,” Elias told The Associated Press.

Callegari said the documents include letters Otto Frank wrote to relatives, friends and officials between April 30, 1941, and Dec. 11, 1941, when Germany declared war on the United States.

The Frank family’s hiding place in a secret annex in an Amsterdam canal-side warehouse has been turned into a museum.

The letters document how Otto Frank tried to arrange for his family – wife Edith, daughters Margo and Anne, and mother-in-law Rosa Hollander – to go to the United States or Cuba.

His attempts to arrange a route out of the Netherlands were unsuccessful. The family took refuge in July 1942, hiding for more than two years before being arrested. Anne Frank described the family’s life in hiding in a diary that has sold an estimated 75 million copies.

Anne Frank died of typhus at age 15 in a concentration camp at Bergen-Belsen, Germany, in 1945. Her father returned to the Netherlands to collect his daughter’s notes and published them in the Netherlands in 1947.