https://journals.law.stanford.edu/stanford-law-policy-review/online/how-52-senators-made-60-51
https://www.senate.gov/CRSpubs/a2a1fac5-da93-470d-8536-f5fb7967146c.pdf
Second link is to ...
Evolution of the Senate’s Role in the Nomination and Confirmation Process: A Brief History
Betsy Palmer - Analyst on Congress and the Legislative Process
May 13, 2009 - Congressional Research Service - RL31948
https://fas.org/sgp/crs/misc/R43331.pdf
Majority Cloture for Nominations: Implications and the “Nuclear” Proceedings
Valerie Heitshusen - Analyst on Congress and the Legislative Process
December 6, 2013 - Congressional Research Service - R43331
Much appreciated.
Much appreciated.