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    The evaluation of rangeland resources by means of multispectral imagery Annual progress report

    Carneggie, D. M. / Poulton, C. E. / Roberts, E. H. | NTRS | 1967

    Xv-11A Description and Preliminary Flight Test

    S. C. Roberts / A. W. Stewart / V. L. Boaz et al. | NTIS | 1967

    Protection of Aircraft Fluid Systems

    J. M. Metcalf / R. E. Roberts / S. D. Bridgeman | NTIS | 1968

    Criteria for lunar site selection

    Binder, A. B. / Roberts, D. L. | NTRS | 1970