Right-click A0021.7z.001 and select "Extract" using 7-Zip or WinRAR . The software will automatically combine all parts to recreate the original file. Do you have the other numbered parts of this archive, or Collections | Solomon R. Guggenheim Museum
The Duke Digital Repository uses A0021 for the sheet music of "Peg o' My Heart" (1913).
Ensure you have A0021.7z.001 , A0021.7z.002 , and any subsequent numbered parts in the same folder.
While "A0021" is a generic identifier, this specific code often refers to several established archival collections:
Within the Department of Defense , A0021 (specifically A0021-1 SAIG) refers to Inspector General investigative files.