The Dr. Herman Roemmich Collection consists of genealogy, correspondence, publications, and research materials relating to the Roemmich family, Heinrich Roemmich, and the book Conflict of Three Cultures: Germans from Russia in America; dating from the 1930s to the 1990s. The collection has been organized into five series: Genealogy, Correspondence, Publication, Research, and Subject.

The Genealogy Series contains information on the Roemmich family. Other spellings of the family name include: Römmich, Römich, Remmich, and Römig. Also included in the series is a number of articles and other works relating to the life and death of Heinrich Roemmich.

The Correspondence Series is comprised of outgoing and incoming letters dating from the early 1930s to the mid-1980s. The majority of the letters are in the German language. The letters are mostly to and from members of the Roemmich family. Some of the names in the letters include: Heinrich Roemmich, Karl Roemmich, Fritz Scherrer, Dr. Fritz Braun, Frank E. Romack, and Alfred H. Kuby.

The Publication Series includes publications authored by Heinrich Roemmich. The publications are all in the German language.

The Research Series consists of materials that were used by Herman Roemmich for his book Conflict of Three Cultures: Germans from Russia in America. The series includes maps and photocopies of publications.

The Subject Series is made up of miscellaneous items that did not directly relate to any other series. Most of the materials are in the German language, and their contents and origin are unidentified.