In 2007 a file of Letters Between University of Heidelberg roommates and lifelong friends, Otto Frank and Nathan Straus Jr., was found in the archives of YIVO: The Institute for Jewish Research.
The Letters also show the lengths Nathan Straus Jr.,.
The Letters revealed for the first time that Otto Frank, diarist Anne\'s father, tried desperately to get his family out of war torn Holland in 1941, fifteen months before they went into hiding in the now famous attic at Prinsengracht 263, Amsterdam.
In 2007 a file of Letters Between University of Heidelberg roommates and lifelong friends, Otto Frank and Nathan Straus Jr., was found in the archives of YIVO: The Institute for Jewish Research