Analysis of information sources in references of the Wikipedia article "كارل خواكيم فريدريش" in Arabic language version.
{{استشهاد ويب}}: صيانة الاستشهاد: الأرشيف كعنوان (link) Copies of Songs for John Doe were destroyed later that same year after Hitler invaded the USSR. Military intelligence and the FBI searched for this supposedly "subversive" material but were unable to find any copies, only locating the Almanac Singers themselves the following year. By that time Hitler had declared war on the USA and the Almanacs (and virtually all Americans) now fully supported the war, and had even issued another album, Dear Mr. President, (in January 1942, after Pearl Harbor) of songs to that effect.{{استشهاد ويب}}: |url= بحاجة لعنوان (مساعدة) والوسيط |title= غير موجود أو فارغ (من ويكي بيانات) (مساعدة){{استشهاد ويب}}: صيانة الاستشهاد: الأرشيف كعنوان (link) Copies of Songs for John Doe were destroyed later that same year after Hitler invaded the USSR. Military intelligence and the FBI searched for this supposedly "subversive" material but were unable to find any copies, only locating the Almanac Singers themselves the following year. By that time Hitler had declared war on the USA and the Almanacs (and virtually all Americans) now fully supported the war, and had even issued another album, Dear Mr. President, (in January 1942, after Pearl Harbor) of songs to that effect.