Looking for episodes from Seasons 14 and 15

Does anyone have information about AB episodes from seasons 14 and 15 (1971 and 72)? I am specifically looking for S14 E38 and S15 E35 which feature performances by Buffy Sainte-Marie. Dick Clark media has told me that these episodes and most from between 1970 and 1975 no longer exist. Any information or leads woud be very helpful! Please e-mail me at lessard.rebecca {at} gmail {dot} com.