The MacDonald Properties (1972-1996) series consists of materials that document the planning and development of MacDonald Ranch, but are not specifically related to the communities of Sunridge or the Foothills. These materials include architectural drawings, master plans, land use studies, water supply plans, topographic maps, tentative maps, and preliminary reports.

The Tapping the Colorado project series (2021-2024) is comprised of 268 color images representing a range of aerial photography documenting the historic critical water levels in Lake Mead and Lake Powell in 2021 and 2022. Stillings' artist statement and curriculum vitae are also included in this series.