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Cross, R. M ,  Downie, A. W ,  Dumbell, Keith R ,  Kaplan, Colin ,  McClean, D ,  Payne, A. M.-M ,  Spicer, C. C ,  World Health Organization ,  [Laboratory and vaccination studies with dried smallpox vaccines : a report to the World Health Organization / W. Chas Cockburn ... [et al.] ; with a statistical note on the trial of smallpox vaccine / by C.C. Spicer, Statistical note on the trial of smallpox vaccine]

Cross, R. M ,  Kaplan, Colin ,  McClean, D ,  World Health Organization ,  [Studies with dried and glycerinated smallpox vaccines of full and diminished potencies / by R.M. Cross and C. Kaplan & D. McLean [sic]]

Cross, R. M ,  Kaplan, Colin ,  McClean, D ,  World Health Organization ,  [Studies with dried and glycerinated smallpox vaccines of full and diminished potencies / by R.M. Cross and C. Kaplan & D. McLean [sic]]

Cross, R. M ,  Downie, A. W ,  Dumbell, Keith R ,  Kaplan, Colin ,  McClean, D ,  Payne, A. M.-M ,  Spicer, C. C ,  World Health Organization ,  [Laboratory and vaccination studies with dried smallpox vaccines : a report to the World Health Organization / W. Chas Cockburn ... [et al.] ; with a statistical note on the trial of smallpox vaccine / by C.C. Spicer, Statistical note on the trial of smallpox vaccine]