It appears that they are readily available in digital form only for cases since 1968, available on microfiche in some library collections for 1953 and later, an

It appears that they are readily available in digital form only for cases since 1968, available on microfiche in some library collections for 1953 and later, and not consistently available in any form prior to 1953[1]. [1] https://www.supremecourt.gov/oral_arguments/availabilityoforalargumenttranscripts.aspx https://www.supremecourt.gov/oral_arguments/availabilityofor...