Here are lists of selected large American companies in 1917 and 1929.  The notes on the spreadsheet tabs are important to read.

Source: Forbes Magazine 50th Anniversary Issue, 9/15/1967

Largest Companies 1917 and 1929 (XLSX)

In our continuing research, we discovered that the Forbes list for 1929 left out some major public retailers; their data for 1929 is in this picture:

More details on these companies and a spreadsheet can be found here:

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