Lillian Anderson Jensen Memorial Library

If you are looking for information about the history of the MonDak region and the people who called it home, you have come to the right place. The MonDak Heritage Center houses the Lillian Anderson Jensen Research Library, which is the largest research library in the region. It includes archives and newspapers from the area dating back to 1890 as well as an ever growing collection of Heritage Cards for genealogical research, a substantial archive of original photographs, and a large selection of reference works to supplement your research.

The Lillian Anderson Jensen Library is the informational hub of the MonDak Heritage Center. The library is named for one of the MonDak’s earliest settlers, who is thought to be the first pioneer child born in Sidney, Montana. Lillian’s family was instrumental in the growth of Sidney and many descendants still live in the area. Stories about Lillian and other settlers can be found among the collection of family histories housed in the library.

In addition to those histories, the library houses more than 10,000 “heritage cards” available for tracing family histories in the area. The library also has an extensive collection of local newspapers dating back to 1908, and a collection of area maps of historical interest.

In addition the library has area high school annuals, minutes of organizations and hundreds of photos of the area. The facility was established to preserve these materials and make them available for research.

The library also houses a number of area maps and aerial photos which are available for viewing by appointment. A list of the available materials will soon be available on this page .

Research Services

Obituaries: To request an obituary, please e-mail us at or send a self-addressed stamped envelope with the name, exact date and location of the individual whose obit you need. Heritage Record Cards are also checked and will be photocopied if one is found matching your request.

Courage Enough Books: To request a look-up in the local history books, please send a self-addressed stamped envelope and include the full name(s) of the person you need.  Courage Enough I is currently out of print but reprint editions will be available in Mid 2016 and the reprints of Courage Enough II have arrived. Courage Enough II is priced at $35 and can be shipped for an additional $5 charge. Courage Enough I will be reprinted as 2 Volumes and will be priced at $80 with shipping an additional $10.

Research: To submit a general research request for information, genealogical or historical, please send a self-addressed stamped envelope and the information you’d like us to look up for you.  Or, fill out a Research Request Form and email it to

Cost for Our Research Services: We ask for a monetary donation to be made to the MonDak Heritage Center for each of the services listed above. Please allow up to three weeks research time.  The museum has a small staff and some requests may take longer to research.