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==chronology of relations==sudan was the first country to recognise the independence of south sudan on 8 july 2011, 1 day prior to independence.
כאמור, סודאן הייתה המדינה הראשונה שהכירה בדרום סודאן כמדינה עצמאית וריבונית כבר ב-8 ביולי 2011, יום לפני הכרזת העצמאות של הדרום.
===nasa===* nasa history series publications (many of which are on-line)**"ep-107 skylab, a guidebook" (1973) 1**"sp-4011 skylab, a chronology" (1977) 1**"sp-4208 living and working in space: a history of skylab" (1983)**"sp-400 skylab, our first space station" (1977)**"sp-401 skylab, classroom in space" (1977)**"sp-399 skylab erep investigations summary" (1978)**"sp-402 a new sun: solar results from skylab" (1979)**"sp-404 skylab's skylab's astronomy and space sciences" (1979)* airlock module under construction (1971) (medium)* airlock and docking module together (1972) (medium)* skylab crew quarters illustration* apollo (in foreground) and skylab space food (m487)===3rd party===* eoportal: skylab* historic spacecraft: skylab* skylab reboost module* skylab reentry (chapter 9 of sp-4208)* skylab cutaway drawing from encyclopædia britannica* cutaway line drawing of skylab* skylab "christmas tree"
* תחנת החלל מיר* תחנת החלל הבינלאומית==קישורים חיצוניים==* nasa history series publications (many of which are on-line)**"ep-107 skylab, a guidebook" (1973)**"sp-4011 skylab, a chronology" (1977)**"sp-4208 living and working in space: a history of skylab" (1983)**"sp-400 skylab, our first space station" (1977)**"sp-401 skylab, classroom in space" (1977)**"sp-399 skylab erep investigations summary" (1978)**"sp-402 a new sun: solar results from skylab" (1979)**"sp-404 skylab's skylab's astronomy and space sciences" (1979)*airlock module under construction (1971) (medium)*airlock and docking module together (1972) (medium)*skylab crew quarters illustration*apollo (in foreground) and skylab space food (m487)===באתרים נוספים=====הערות שוליים==