Gilbert Postma 86 Rock Rapids, Iowa July 30, 2018 Gilbert “Gib” Postma, 86, of Rock Rapids, Iowa, died Monday, July 30, 2018, at Sanford Rock Rapids Medical Center. Funeral services were Friday, Aug. 3, at First Reformed Church, Doon, Iowa, with interment in Hillside Cemetery, Doon. Gilbert Postma was born May 25, 1932, near Doon,…