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-sound-in-steady-state-counter-flowing-normal-and-superfluid-helium-ii</loc><lastmod>2026-09-21T15:31:29.058Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690049572/model-atmospheres-for-rr-lyrae-stars</loc><lastmod>2026-09-21T15:31:29.059Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690049660/comparison-of-procedures-used-to-analyze-spectroscopic-observations-the-7820-angstrom-units-carbon-d</loc><lastmod>2026-09-21T15:31:29.060Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690049675/a-hybrid-coding-scheme-for-discrete-memoryless-channels</loc><lastmod>2026-09-21T15:31:29.060Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690049955/pseudorandom-frequency-modulation-in-range-doppler-radar</loc><lastmod>2026-09-21T15:31:29.061Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690049961/an-experimental-twenty-inch-segmented-active-mirror</loc><lastmod>2026-09-21T15:31:29.061Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690049967/operating-characteristics-of-the-stratoscope-ii-balloon-borne-telescope</loc><lastmod>2026-09-21T15:31:29.062Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690050020/preparation-and-superconducting-properties-of-thin-films-of-transition-metal-interstitial-compounds</loc><lastmod>2026-09-21T15:31:29.063Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690050026/optical-surface-degradation-from-combined-ultraviolet-radiation-and-outgassed-materials</loc><lastmod>2026-09-21T15:31:29.063Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690050095/quadrupole-ionization-gauge</loc><lastmod>2026-09-21T15:31:29.064Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690050226/computer-program-to-predict-heat-transfer-through-glass</loc><lastmod>2026-09-21T15:31:29.065Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690050252/plasma-transport-property-correlation-using-ionization-fraction</loc><lastmod>2026-09-21T15:31:29.065Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690050292/supersonic-wake-flow-visualization</loc><lastmod>2026-09-21T15:31:29.066Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690050299/the-effect-of-viscosity-in-hypervelocity-impact-cratering</loc><lastmod>2026-09-21T15:31:29.066Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690050315/meteoroid-protection-by-multiwall-structures</loc><lastmod>2026-09-21T15:31:29.067Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690050477/wind-measurements-in-noctilucent-clouds</loc><lastmod>2026-09-21T15:31:29.067Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690050694/electron-shielding-in-heavily-doped-semiconductors</loc><lastmod>2026-09-21T15:31:29.068Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690050958/resonant-vibration-of-the-magnetosphere-observed-from-explorer-26</loc><lastmod>2026-09-21T15:31:29.069Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690050964/some-characteristics-of-non-two-stream-irregularities-in-the-equatorial-electrojet</loc><lastmod>2026-09-21T15:31:29.069Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690051027/transient-burning-of-spherical-symmetric-fuel-droplets</loc><lastmod>2026-09-21T15:31:29.070Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690051034/linearized-analysis-of-flow-of-incompressible-laminar-jet-contained-between-side-walls</loc><lastmod>2026-09-21T15:31:29.070Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690051122/ion-chemistry-of-the-d-and-e-regions-a-survey-for-working-group-11-of-the-inter-union-commission-on</loc><lastmod>2026-09-21T15:31:29.071Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690051134/non-uniform-growth-of-the-ring-current-belt</loc><lastmod>2026-09-21T15:31:29.071Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690051194/multimegawatt-thermionic-reactor-systems-for-space-applications</loc><lastmod>2026-09-21T15:31:29.072Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690051426/preparation-and-compression-molding-of-salt-like-intermediate-pyrrone-btda-eg-dab</loc><lastmod>2026-09-21T15:31:29.073Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690051444/shorter-combustors-for-high-temperature-jet-engines</loc><lastmod>2026-09-21T15:31:29.073Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690051455/on-the-interaction-of-intense-acoustic-fields-and-viscous-fluid-flows</loc><lastmod>2026-09-21T15:31:29.074Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690051462/renormalization-of-a-finite-matrix-hamiltonian</loc><lastmod>2026-09-21T15:31:29.074Z</lastmod></url><url><loc>https://searchnasa.com/record/nasa%3A19690051547/analysis-of-cross-polarized-components-of-radar-reflection-data</loc><lastm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