This sub-series includes letters belonging to members of the Hill family. Of particular note are letters and illustrations from German artist Hermann Haase, correspondence with the Northern Pacific Railway Company regarding Hill’s art commissions, letters from American painter Edgar S. Paxson, African American educator and author Booker T. Washington, National Park Service landscape architect Merel S. Sager, and director of the National Park Service Horace Albright.

Letter regarding Jerome Shaffer's estate. Correspondence between Abby Hill and Jerome Shaffer can be found in the subseries for correspondence about tuberculosis.

Hill reminisces about her life and career in this form letter sent to several of her friends. See letters to "Mrs. Bogle" and "Will and wife."

Hill reminisces about her life and career in this form letter sent to several of her friends. See letters to "Mrs. Bogle" and Mrs. C.W. Weyer.

This sub-series includes letters belonging to members of the Hill family. Of particular note are letters and illustrations from German artist Hermann Haase, correspondence with the Northern Pacific Railway Company regarding Hill’s art commissions, letters from American painter Edgar S. Paxson, African American educator and author Booker T. Washington, National Park Service landscape architect Merel S. Sager, and director of the National Park Service Horace Albright.

C.A. Snowden (editor, Tacoma Ledger). Includes newsclipping titled "Wheeling Through Europe" which details the Hill's trip bicycling through Europe.

This sub-series includes letters belonging to members of the Hill family. Of particular note are letters and illustrations from German artist Hermann Haase, correspondence with the Northern Pacific Railway Company regarding Hill’s art commissions, letters from American painter Edgar S. Paxson, African American educator and author Booker T. Washington, National Park Service landscape architect Merel S. Sager, and director of the National Park Service Horace Albright.

This sub-series includes letters belonging to members of the Hill family. Of particular note are letters and illustrations from German artist Hermann Haase, correspondence with the Northern Pacific Railway Company regarding Hill’s art commissions, letters from American painter Edgar S. Paxson, African American educator and author Booker T. Washington, National Park Service landscape architect Merel S. Sager, and director of the National Park Service Horace Albright.

Letter regarding Frank Hill's health.

This sub-series includes letters belonging to members of the Hill family. Of particular note are letters and illustrations from German artist Hermann Haase, correspondence with the Northern Pacific Railway Company regarding Hill’s art commissions, letters from American painter Edgar S. Paxson, African American educator and author Booker T. Washington, National Park Service landscape architect Merel S. Sager, and director of the National Park Service Horace Albright.