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Looking at the dates, this apparently was at the end of the Rocks campaign, since the DTL sessions started right after in the summer of '77 (which explains maybe why only the title track of that one airs here).
Or actually, according to Wiki, these shows were <during> the DTL sessions, which had already began in June before these shows at the end of the month (which are mis-tagged as being in July). Man, band workloads were nuts back then!