This drawing package contains drawings of the AABNCP (Advanced Airborne National Command Post), or at least an early version of the design. The aircraft shown here is not quite the E-4 that actually flew, and differs in several notable ways. Most obvious are the long dorsal fairing covering satellite dishes, and especially the two extra jet engine pods under the wing roots (which appear to be electrical generators rather than additional thrust units).
1) Boeing drawing 65B59599, “Markings Installation Decorative, Exterior AABNCP.” 26881X 7200 pixels, dated 1973
2) Boeing drawing 747-CP-4007, “747 AABNCP Study Configuration Phase 1B,” 30310X7200 pixels, dated 1972 Also included are half-size and quarter-size version for easier viewing and printing.