William Buettler (1883-1963) and Ralph Arnold (1889-1961) both worked for architect Wilfred W. Beach in Sioux City. The two began their partnership in Sioux City in 1912, and dissolved it when the advent of World War II stopped almost all non-military construction.: 37
- Florence Crittenton Home and Maternity Hospital (1913), 1105-1111 28th St. Sioux City, Iowa, NRHP-listed
- Hartington Carnegie Library (1914–15), 106 S Broadway, Hartington, Nebraska
- Trimble Block (1915), 6th & Pierce, Sioux City, Iowa
- Sachse, Bunn & Company Block (1920; Colonial Revival), 201 S. 5th St., Sioux City, Iowa, a contributing building in the Cherokee Commercial Historic District: 50–51
- Sioux City Masonic Temple (1921–22; Spanish Colonial Revival), NRHP-listed
- Le Mars Central High School, (1924, 1952 additions; Colonial Revival), 335 1st Ave., SW., Le Mars, Iowa, NRHP-listed
- First Baptist Church of Vermillion (1925), 101 E. Main St. Vermillion, South Dakota, design of second wing (1925), adding to first wing designed by Wallace LeRoy Dow and built during 1889–90.
- United States Post Office and Courthouse (1934; Moderne and Art Deco) 316-320 6th St., Sioux City, Iowa, NRHP-listed
Also the NRHP-listed Milo Public Library, at 4 Pleasant St., Milo, Maine, built in 1922, which has Frederick A. Paterson of Bangor recorded as its architect, is almost identical in design to Beuttler and Arnold's Hartington, Nebraska library. Both appear generally to follow the Type F plan provided by James Bertram's Notes on Library Buildings (1910). The Milo library's building committee inquired about, and may have purchased, Beuttler and Arnold's detailed plans.: 2, 3
- James E. Jacobsen. "Cherokee Commercial Historic District". National Park Service. Retrieved 2016-03-10. with 24 photos
- Kirk F. Mohney (October 11, 1988). "National Register of Historic Places Registration: Milo Public Library". National Park Service. p. 3. Retrieved July 13, 2016. with two photos from 1988
- "Beuttler & Arnold, Architects". Retrieved July 13, 2016. within Place Makers of Nebraska: The Architects, edited by David Murphy, Edward F. Zimmer, and Lynn Meyer, part of the Nebraska State Historical Society's Encyclopedia of Nebraska History
- Marcy Stenwall (February 9, 2001). "National Register of Historic Places Registration: Sioux City Masonic Hall". National Park Service. Retrieved July 13, 2016. with 12 photos
- Sharon Starling. "Le Mars Central High School". National Park Service. Retrieved 2016-10-30.
- John Burrows (November 5, 1980). "National Register of Historic Places Inventory/Nomination: First Baptist Church of Vermillion / First Baptist Church". National Park Service. Retrieved July 13, 2016. with nine photos from 1980
- "Federal Building & U.S. Courthouse, Sioux City, IA". General Services Administration. Retrieved 2016-11-12.
- Beuttler & Arnold, Architects, within Place Makers of Nebraska: The Architects, edited by David Murphy, Edward F. Zimmer, and Lynn Meyer, part of the Nebraska State Historical Society's Encyclopedia of Nebraska History