<prompt> Translate the following text to EnglishKatika mwisho wa kitabu hicho, Ledbetter anatoa wito wake wa mabadiliko, akidai kwamba saa ya PBS irudishwe nyuma hadi miaka ya 1950, wakati wafadhili walipofikiria kwanza utangazaji wa umma wa Amerika.  <response>: At books end, Ledbetter issues his clarion call for reform, demanding that the PBS clock be turned back to the 50s, when the philanthropoids first imagined American public broadcasting. 