Cite
MLA Citation
Colin Burgess. Sigma 7 : the six Mercury orbits of Walter M. Schirra, Jr.. Switzerland : Springer, 2016. http://access.bl.uk/ark:/81055/vdc_100071247510.0x000001
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Colin Burgess. Sigma 7 : the six Mercury orbits of Walter M. Schirra, Jr.. Switzerland : Springer, 2016. http://access.bl.uk/ark:/81055/vdc_100071247510.0x000001