1. Heaps, S. N., and Scoggins, W. H. (1965). Lunar terrain analysis. George C. Marshall Space Flight Center—National Aeronautics and Space Administration Internal Note (Huntsville, Alabama).
2. King, R. (1964), ALSS Molab studies-mission operational aspects. George C. Marshall Space Flight Center—National Aeronautics and Space Administration Tech. Mem. TM X-53032.2 (Huntsville, Alabama).
3. Hale, D. P. (1964). A lunar scientific mission profile. George C. Marshall Space Flight Center—National Aeronautics and Space Administration Internal Note (Huntsville, Alabama).
4. Beattie, D. (1964). Personal communication. Office of Manned Space Flight–National Aeronautics and Space Administration (Washington, D.C.).
5. Yarbrough, L. S. (1964). An operations plan based on a lunar scientific mission profile. George C. Marshall Space Flight Center–National Aeronautics and Space Administration Internal Note (Huntsville, Alabama).