Diagrams of the Viking probe and its mission, collected by Geoffrey Eglinton One untitled chart and ten A4 black and white labelled diagrams with the following titles: General Arrangement [of the Viking spacecraft] Launch and transfer orbit Arrival at Mars [showing Mars orbit and stages of jettison Mars injection stage, orbiter-lander in synchronous orbit, Mars injection burn] Mars lander Mass/velocity history Mission summary diagram Lift-off, rendezvous and return Spacecraft Mars Orbit description Earth, Sun and Mars relative positions for outward journey The return to earth These images may have been for the creation of slides, as they are held in an envelope with 'S Tonkin' and '35mm neg slides' written on the front. Also written in a different hand is 're paper Eglinton and Tonkin for Viking Mars Proposal pre-1976.' c.1975