The Netherlands has ratified an accord to open a long-secret archive of Nazi death camp records in Germany, the government said Thursday, another step toward giving scholars access to a vast collection of historically invaluable Holocaust documents. The Dutch became the fourth of the 11 countries on the archive's governing body to complete the legal procedures. Officials said nearly all the others were expected to formally adopt the measures by the end of the year. After years of pressure from Holocaust survivors, the committee voted last year to amend a 1955 treaty to allow research access to the storehouse kept in Bad Arolsen, Germany, run by the International Tracing Service of the International Committee of the Red Cross. But unless procedures are changed by consensus, all 11 countries must ratify the accord before scholars can view the material.