00687nam a2200169 a 450000500170000000800410001703500150005805000280007310000220010124501510012326000700027444000990034465000210044365000110046470000210047570000210049620260817162521.0                                          a.b10070023  aTL789.8 U6 U57 no. 1005  aHastings, Leon J. 3aAn analytical and experimental investigation of a 1.8 by 3.7 meter fresnel lens solar concentrator /bby ..., Steve L. Allums and Warren S. Jensen  aHuntsville, Ala. :bGeorge C. Marshall Space Flight Center,c1977 0aUnited States. National Aeronautics and Space Administration. NASA technical paper ;vno. 1005 0aSunxTemperature 0aLenses1 aJensen, Warren S1 aAllums, Steve L.