The Peter A.J. Dalton-Morris architectural records (2006-49-0) consist of written and drawn project records of Dalton-Morris's professional practice situated at Beecher Lane and Woodruff Street, Litchfield, CT from 1965-2003, with additional documents dating from 1953. The majority of projects involved residences in and around Litchfield, CT, and include new houses and alterations and additions to existing houses. Dalton-Ross also created designs for several commercial projects in Litchfield and beyond, including the The Travelers Insurance Company's former Cliff House constructed on Avon Mountain in 1961.

The collection includes architectural drawings and specifications on paper and Mylar and professional certificates and licenses qualifications.

An accrual of papers pertaining to work completed at 23 West Street was donated in 2019. It is stored in Small Acquisitions.