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Where can I find historical United States treasury note volume?
The Securities Industry and Financial Markets Association (SIFMA) publishes these and other relevant data on their Statistics page, in the "Treasury & Agency" section. The volume spreadsheet contains annual and monthly data with bins for varying maturities. These data only go back as far as January 2001 (in most cases). SIFMA also publishes treasury issuances with monthly data for bills, notes, bonds, etc. going back as far as January 1980. Most of this information comes from the Daily Treasury Statements, so that's another source of specific information that you could aggregate yourself. Somewhere I have a parser for the historical data (since the Treasury doesn't provide it directly; it's only available as daily text files). I'll post it if I can find it. It's buried somewhere at home, I think.