Deletion of Earl Nightingale

Comment: Easily satisfies . A Google Book search shows 641 results. Many are books '''by''' Nightingale, but a number are significant coverage in books by others.  He starred on the 1940's radio show Sky King. He started the audio self-improvement industry. His recording "The Strangest Secret" was a gold record as the largest selling non-entertainment record. He was a syndicated radio speaker with a program heard daily in 38 countries, and is in the Radio Hall of Fame.  See "http://books.google.com/books?id=T2PccgbEW-kC&pg=PA56&dq=%22earl+nightingale%22&lr=&as_drrb_is=q&as_minm_is=0&as_miny_is=&as_maxm_is=0&as_maxy_is=&as_brr=0&as_pt=ALLTYPES#PPA52,M1 Secrets of superstar speakers"(2000) by Lillet Walters, pages 52-57. He is discussed in a great many self-help books and described as a pioneer in that field or an inspiration to the writer
Stance: keep
Cited policy: Wikipedia:Notability (WP:BIO)