There IS such a CD. I knew Secorra Plarres-Montes from our work together in Africa, and through her met LH. Five years later I provided percussion for a recording of "Flight 641" with LH at a studio in Los Angeles in 1981. Also on this track was Jorge Calderones playing bass, and a pedal steel guitar player from Tucson. If I remember it right Lawrence played guitar and overdubbed a track of dobro. There was also a wonderful fiddle player and a banjo player who I think was John Hickman. As I recall, the backup singers were very drunk during the recording. At this time LH was also finishing a long long track about La Migra (US Immigration). Included on that was Lupe Arrellano on cello and Lawrence on viola, as well as the same steel guitar player from Tucson. Lawrence was in medical school at the time and did not expect that these songs would be released. I believe someone has transferred the tapes to disc, however, along with other songs recorded between 1976 and 1981 or 82.
I have recently spoken to someone who has heard these. Thank you Lupe de Vega for calling my attention to this thread!