Prior to 1979, FCC records were kept on index cards, which were destroyed after computerization was complete. Through a lucky accident, microfiche copies of those cards survived in good condition.
The Station history page here has been enhanced to pull up the history card, bypassing an extremely slow FCC web page. This feature is especially useful to set the date of first license, which is not available in the FCC databases to the best of my knowledge.
Some of the links are available only to volunteers
This is what the history card for this station looked like
Note that history is tied to a “facility” (transmitter site), not a call sign or frequency. Of course, stations licensed after 1979 will have no history card.