Ackerman, Frederick L. "Population Expectations, Zoning, Appraisals and Debt."; "The Technologist Looks at the Depression"; "The Facts Behind Technology"; "The Operating Characteristics of Our Productive Economy" "Nine Photographs of the New Hudson River Budge", 1932-1934, undated

Ackerman, Frederick L. "Population Expectations, Zoning, Appraisals and Debt."; "The Technologist Looks at the Depression"; "The Facts Behind Technology"; "The Operating Characteristics of Our Productive Economy" "Nine Photographs of the New Hudson River Budge", 1932-1934, undated, Box: 18, Folder: 2. Clarence Stein papers, 3600. Division of Rare and Manuscript Collections. https://archives.library.cornell.edu/repositories/2/archival_objects/414706 Accessed January 23, 2026.