Q. I need to find full text of the Supreme Court nomination hearings. The particular time period is from Hugo Black to Sherman Minton.

We have a book which  should help you. It's The Supreme Court of the United States : hearings and reports on successful and unsuccessful nominations of Supreme Court Justices by the Senate JudiciaryCommittee, 1916-1972 / compiled by Roy M. Mersky, J. Myron Jacobstein.

It is located in Government Documents, the second floor of the Central Reading Room. The call no. is KF8744 .J8

For  hearings after 1971, online access is available from GPO
http://www.gpo.gov/fdsys/browse/committee.action?chamber=senate&committee=judiciary