(Flying Dutchman, IA-12-30) N. of Shell Rock, Butler Township, Butler County, IA. IA3 N. 2.3 miles from jct with Glen Hall Rd. on the N. side of Shell Rock to the quilt on the E. side of the road at 31121. Norm & Jan Mulder. (N42 44.625 W92 36.291) Photos by Jack & June Schmidt 7-7-12.