Church and civil records for Hessen-Nassau available on FamilySearch Historical Records: https://familysearch.org/search/collection/1768560. Courtesy Staatsarchiv Marburg.
The restored church book of Zimmersrode, Gilsa and Dorheim aus dem Jahre 1663 by Holger Th. Graf and Patrick Sturm. Marburg, 2010. See also CD 7835. Contains records for the years 1611-1663 (with some gaps). The book has a transcription of the records.
Indexed civil records for Iba, Machtlos, and Gilfershaussen Kr. Rotenburg, Hessen-Nassau [1876- ] are available at: Iba Church book index
Church records available: http://wiki-de.genealogy.net/Hessische_Kirchenb%C3%BCcher
Church records available on Ancestry.com: https://search.ancestry.com/search/db.aspx?dbid=9949
http://wiki-de.genealogy.net/Hessische_Kirchenbuchbearbeitungen#Regierungsbezirk_Kassel
Published works of Helmut Thiele.http://www.kasselwiki.de/index.php?title=Helmut_Thiele. Extractions from the Cassel
Marriage records of Kassel and other localities in Hessen-Nassau in volumes available at Family History Library: https://www.familysearch.org/search/catalog/1299728?availability=Family%20History%20Library
Extraction of entries from Dornholzhausen (Oberlahnkreis) FamilySearch Digital Library