Phosphates and hydroponics / Frank Lockhart ; interviewed by Lindsay Audin.
PRA Archive #:
Discussion of the threat of phosphate depletion, and the potential for hydroponics to answer the agricultural problem.
Date Recorded on:
Date Broadcast on:
1 reel (55 min.) : 7 1/2 ips, mono.
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Los Angeles : Pacifica Radio Archive, 1976.
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