"Excavating - New York"
MLA
Stieglitz, Alfred, 1864-1946. "Excavating - New York". Box 129, folder 2496. n.d.. https://collections.library.yale.edu/catalog/2000113.
APA, 6th edition
Stieglitz, Alfred, 1864-1946. (["Box 129, folder 2496"])(n.d.)["Excavating - New York"]. https://collections.library.yale.edu/catalog/2000113.