Established in Kansas City in 1983, Architectural & Historical Research, LLC, is the oldest cultural resources consulting firm in the state of Missouri. Cydney E. Millstein, M.A., founder and principal, is a certified 36 CFR Part 61, meeting the Secretary of Interior's Standards for architectural historians. AHR is a registered women business enterprise with the City of Kansas City, Missouri.

Houses of Missouri, 1870-1940. By Cydney Millstein and Carol Grove, Foreword by Richard Longstreth. Acanthus Press, NY 2008. Nearly 300 duotone photographs, drawings, and floor plans. Available now.