There are no chapter divisions in the first installment, but this installment contains Chapters IV & V.
Material in the public domain. No restrictions on use.
Donnel, William M. "Pioneers of Marion County. Chapters IV-V." The Annals of Iowa 1870 (1870), 34-44.
Available at: http://ir.uiowa.edu/annals-of-iowa/vol1870/iss1/6