US Treasury yield curve rate data PRIOR to 1990

Does anyone know where to find US Treasury yield curve rate data for dates earlier than 1990?

Example of data I'm currently using:
https://www.quandl.com/data/USTREASURY/YIELD-Treasury-Yield-Curve-Rates

 

H-15, dude
https://www.federalreserve.gov/datadownload/Choose.aspx?rel=H15

 

Hey man I would check out the FRED website (St Louis Fed)

See link below

https://fred.stlouisfed.org/categories/115

If you know how to write python, you can easily get all this info into python and do whatever you want with it.

 

Thanks, gentlemen! Exactly what I was looking for.